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authorMartin Braun <martin.braun@ettus.com>2014-10-07 11:25:20 +0200
committerMartin Braun <martin.braun@ettus.com>2014-10-07 11:25:20 +0200
commitfd3e84941de463fa1a7ebab0a69515b4bf2614cd (patch)
tree3fa721a13d41d2c0451d663a59a220a38fd5e614 /fpga/usrp2/opencores/i2c/rtl
parent3b66804e41891e358c790b453a7a59ec7462dba4 (diff)
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Removed copy of FPGA source files.
Diffstat (limited to 'fpga/usrp2/opencores/i2c/rtl')
-rw-r--r--fpga/usrp2/opencores/i2c/rtl/verilog/i2c_master_bit_ctrl.v538
-rw-r--r--fpga/usrp2/opencores/i2c/rtl/verilog/i2c_master_byte_ctrl.v344
-rw-r--r--fpga/usrp2/opencores/i2c/rtl/verilog/i2c_master_defines.v64
-rw-r--r--fpga/usrp2/opencores/i2c/rtl/verilog/i2c_master_top.v301
-rw-r--r--fpga/usrp2/opencores/i2c/rtl/verilog/timescale.v2
-rw-r--r--fpga/usrp2/opencores/i2c/rtl/vhdl/I2C.VHD620
-rw-r--r--fpga/usrp2/opencores/i2c/rtl/vhdl/i2c_master_bit_ctrl.vhd495
-rw-r--r--fpga/usrp2/opencores/i2c/rtl/vhdl/i2c_master_byte_ctrl.vhd370
-rw-r--r--fpga/usrp2/opencores/i2c/rtl/vhdl/i2c_master_top.vhd359
-rw-r--r--fpga/usrp2/opencores/i2c/rtl/vhdl/readme25
-rw-r--r--fpga/usrp2/opencores/i2c/rtl/vhdl/tst_ds1621.vhd283
11 files changed, 0 insertions, 3401 deletions
diff --git a/fpga/usrp2/opencores/i2c/rtl/verilog/i2c_master_bit_ctrl.v b/fpga/usrp2/opencores/i2c/rtl/verilog/i2c_master_bit_ctrl.v
deleted file mode 100644
index edab94f61..000000000
--- a/fpga/usrp2/opencores/i2c/rtl/verilog/i2c_master_bit_ctrl.v
+++ /dev/null
@@ -1,538 +0,0 @@
-/////////////////////////////////////////////////////////////////////
-//// ////
-//// WISHBONE rev.B2 compliant I2C Master bit-controller ////
-//// ////
-//// ////
-//// Author: Richard Herveille ////
-//// richard@asics.ws ////
-//// www.asics.ws ////
-//// ////
-//// Downloaded from: http://www.opencores.org/projects/i2c/ ////
-//// ////
-/////////////////////////////////////////////////////////////////////
-//// ////
-//// Copyright (C) 2001 Richard Herveille ////
-//// richard@asics.ws ////
-//// ////
-//// This source file may be used and distributed without ////
-//// restriction provided that this copyright statement is not ////
-//// removed from the file and that any derivative work contains ////
-//// the original copyright notice and the associated disclaimer.////
-//// ////
-//// THIS SOFTWARE IS PROVIDED ``AS IS'' AND WITHOUT ANY ////
-//// EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED ////
-//// TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS ////
-//// FOR A PARTICULAR PURPOSE. IN NO EVENT SHALL THE AUTHOR ////
-//// OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, ////
-//// INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES ////
-//// (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE ////
-//// GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR ////
-//// BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF ////
-//// LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT ////
-//// (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT ////
-//// OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE ////
-//// POSSIBILITY OF SUCH DAMAGE. ////
-//// ////
-/////////////////////////////////////////////////////////////////////
-
-// CVS Log
-//
-// $Id: i2c_master_bit_ctrl.v,v 1.12 2006/09/04 09:08:13 rherveille Exp $
-//
-// $Date: 2006/09/04 09:08:13 $
-// $Revision: 1.12 $
-// $Author: rherveille $
-// $Locker: $
-// $State: Exp $
-//
-// Change History:
-// $Log: i2c_master_bit_ctrl.v,v $
-// Revision 1.12 2006/09/04 09:08:13 rherveille
-// fixed short scl high pulse after clock stretch
-// fixed slave model not returning correct '(n)ack' signal
-//
-// Revision 1.11 2004/05/07 11:02:26 rherveille
-// Fixed a bug where the core would signal an arbitration lost (AL bit set), when another master controls the bus and the other master generates a STOP bit.
-//
-// Revision 1.10 2003/08/09 07:01:33 rherveille
-// Fixed a bug in the Arbitration Lost generation caused by delay on the (external) sda line.
-// Fixed a potential bug in the byte controller's host-acknowledge generation.
-//
-// Revision 1.9 2003/03/10 14:26:37 rherveille
-// Fixed cmd_ack generation item (no bug).
-//
-// Revision 1.8 2003/02/05 00:06:10 rherveille
-// Fixed a bug where the core would trigger an erroneous 'arbitration lost' interrupt after being reset, when the reset pulse width < 3 clk cycles.
-//
-// Revision 1.7 2002/12/26 16:05:12 rherveille
-// Small code simplifications
-//
-// Revision 1.6 2002/12/26 15:02:32 rherveille
-// Core is now a Multimaster I2C controller
-//
-// Revision 1.5 2002/11/30 22:24:40 rherveille
-// Cleaned up code
-//
-// Revision 1.4 2002/10/30 18:10:07 rherveille
-// Fixed some reported minor start/stop generation timing issuess.
-//
-// Revision 1.3 2002/06/15 07:37:03 rherveille
-// Fixed a small timing bug in the bit controller.\nAdded verilog simulation environment.
-//
-// Revision 1.2 2001/11/05 11:59:25 rherveille
-// Fixed wb_ack_o generation bug.
-// Fixed bug in the byte_controller statemachine.
-// Added headers.
-//
-
-//
-/////////////////////////////////////
-// Bit controller section
-/////////////////////////////////////
-//
-// Translate simple commands into SCL/SDA transitions
-// Each command has 5 states, A/B/C/D/idle
-//
-// start: SCL ~~~~~~~~~~\____
-// SDA ~~~~~~~~\______
-// x | A | B | C | D | i
-//
-// repstart SCL ____/~~~~\___
-// SDA __/~~~\______
-// x | A | B | C | D | i
-//
-// stop SCL ____/~~~~~~~~
-// SDA ==\____/~~~~~
-// x | A | B | C | D | i
-//
-//- write SCL ____/~~~~\____
-// SDA ==X=========X=
-// x | A | B | C | D | i
-//
-//- read SCL ____/~~~~\____
-// SDA XXXX=====XXXX
-// x | A | B | C | D | i
-//
-
-// Timing: Normal mode Fast mode
-///////////////////////////////////////////////////////////////////////
-// Fscl 100KHz 400KHz
-// Th_scl 4.0us 0.6us High period of SCL
-// Tl_scl 4.7us 1.3us Low period of SCL
-// Tsu:sta 4.7us 0.6us setup time for a repeated start condition
-// Tsu:sto 4.0us 0.6us setup time for a stop conditon
-// Tbuf 4.7us 1.3us Bus free time between a stop and start condition
-//
-
-// synopsys translate_off
-`include "timescale.v"
-// synopsys translate_on
-
-`include "i2c_master_defines.v"
-
-module i2c_master_bit_ctrl(
- clk, rst, nReset,
- clk_cnt, ena, cmd, cmd_ack, busy, al, din, dout,
- scl_i, scl_o, scl_oen, sda_i, sda_o, sda_oen
- );
-
- //
- // inputs & outputs
- //
- input clk;
- input rst;
- input nReset;
- input ena; // core enable signal
-
- input [15:0] clk_cnt; // clock prescale value
-
- input [3:0] cmd;
- output cmd_ack; // command complete acknowledge
- reg cmd_ack;
- output busy; // i2c bus busy
- reg busy;
- output al; // i2c bus arbitration lost
- reg al;
-
- input din;
- output dout;
- reg dout;
-
- // I2C lines
- input scl_i; // i2c clock line input
- output scl_o; // i2c clock line output
- output scl_oen; // i2c clock line output enable (active low)
- reg scl_oen;
- input sda_i; // i2c data line input
- output sda_o; // i2c data line output
- output sda_oen; // i2c data line output enable (active low)
- reg sda_oen;
-
-
- //
- // variable declarations
- //
-
- reg sSCL, sSDA; // synchronized SCL and SDA inputs
- reg dscl_oen; // delayed scl_oen
- reg sda_chk; // check SDA output (Multi-master arbitration)
- reg clk_en; // clock generation signals
- wire slave_wait;
-// reg [15:0] cnt = clk_cnt; // clock divider counter (simulation)
- reg [15:0] cnt; // clock divider counter (synthesis)
-
- // state machine variable
- reg [16:0] c_state; // synopsys enum_state
-
- //
- // module body
- //
-
- // whenever the slave is not ready it can delay the cycle by pulling SCL low
- // delay scl_oen
- always @(posedge clk)
- dscl_oen <= #1 scl_oen;
-
- assign slave_wait = dscl_oen && !sSCL;
-
-
- // generate clk enable signal
- always @(posedge clk or negedge nReset)
- if(~nReset)
- begin
- cnt <= #1 16'h0;
- clk_en <= #1 1'b1;
- end
- else if (rst)
- begin
- cnt <= #1 16'h0;
- clk_en <= #1 1'b1;
- end
- else if ( ~|cnt || !ena)
- begin
- cnt <= #1 clk_cnt;
- clk_en <= #1 1'b1;
- end
- else if (slave_wait)
- begin
- cnt <= #1 cnt;
- clk_en <= #1 1'b0;
- end
- else
- begin
- cnt <= #1 cnt - 16'h1;
- clk_en <= #1 1'b0;
- end
-
-
- // generate bus status controller
- reg dSCL, dSDA;
- reg sta_condition;
- reg sto_condition;
-
- // synchronize SCL and SDA inputs
- // reduce metastability risc
- always @(posedge clk or negedge nReset)
- if (~nReset)
- begin
- sSCL <= #1 1'b1;
- sSDA <= #1 1'b1;
-
- dSCL <= #1 1'b1;
- dSDA <= #1 1'b1;
- end
- else if (rst)
- begin
- sSCL <= #1 1'b1;
- sSDA <= #1 1'b1;
-
- dSCL <= #1 1'b1;
- dSDA <= #1 1'b1;
- end
- else
- begin
- sSCL <= #1 scl_i;
- sSDA <= #1 sda_i;
-
- dSCL <= #1 sSCL;
- dSDA <= #1 sSDA;
- end
-
- // detect start condition => detect falling edge on SDA while SCL is high
- // detect stop condition => detect rising edge on SDA while SCL is high
- always @(posedge clk or negedge nReset)
- if (~nReset)
- begin
- sta_condition <= #1 1'b0;
- sto_condition <= #1 1'b0;
- end
- else if (rst)
- begin
- sta_condition <= #1 1'b0;
- sto_condition <= #1 1'b0;
- end
- else
- begin
- sta_condition <= #1 ~sSDA & dSDA & sSCL;
- sto_condition <= #1 sSDA & ~dSDA & sSCL;
- end
-
- // generate i2c bus busy signal
- always @(posedge clk or negedge nReset)
- if(!nReset)
- busy <= #1 1'b0;
- else if (rst)
- busy <= #1 1'b0;
- else
- busy <= #1 (sta_condition | busy) & ~sto_condition;
-
- // generate arbitration lost signal
- // aribitration lost when:
- // 1) master drives SDA high, but the i2c bus is low
- // 2) stop detected while not requested
- reg cmd_stop;
- always @(posedge clk or negedge nReset)
- if (~nReset)
- cmd_stop <= #1 1'b0;
- else if (rst)
- cmd_stop <= #1 1'b0;
- else if (clk_en)
- cmd_stop <= #1 cmd == `I2C_CMD_STOP;
-
- always @(posedge clk or negedge nReset)
- if (~nReset)
- al <= #1 1'b0;
- else if (rst)
- al <= #1 1'b0;
- else
- al <= #1 (sda_chk & ~sSDA & sda_oen) | (|c_state & sto_condition & ~cmd_stop);
-
-
- // generate dout signal (store SDA on rising edge of SCL)
- always @(posedge clk)
- if(sSCL & ~dSCL)
- dout <= #1 sSDA;
-
- // generate statemachine
-
- // nxt_state decoder
- parameter [16:0] idle = 17'b0_0000_0000_0000_0000;
- parameter [16:0] start_a = 17'b0_0000_0000_0000_0001;
- parameter [16:0] start_b = 17'b0_0000_0000_0000_0010;
- parameter [16:0] start_c = 17'b0_0000_0000_0000_0100;
- parameter [16:0] start_d = 17'b0_0000_0000_0000_1000;
- parameter [16:0] start_e = 17'b0_0000_0000_0001_0000;
- parameter [16:0] stop_a = 17'b0_0000_0000_0010_0000;
- parameter [16:0] stop_b = 17'b0_0000_0000_0100_0000;
- parameter [16:0] stop_c = 17'b0_0000_0000_1000_0000;
- parameter [16:0] stop_d = 17'b0_0000_0001_0000_0000;
- parameter [16:0] rd_a = 17'b0_0000_0010_0000_0000;
- parameter [16:0] rd_b = 17'b0_0000_0100_0000_0000;
- parameter [16:0] rd_c = 17'b0_0000_1000_0000_0000;
- parameter [16:0] rd_d = 17'b0_0001_0000_0000_0000;
- parameter [16:0] wr_a = 17'b0_0010_0000_0000_0000;
- parameter [16:0] wr_b = 17'b0_0100_0000_0000_0000;
- parameter [16:0] wr_c = 17'b0_1000_0000_0000_0000;
- parameter [16:0] wr_d = 17'b1_0000_0000_0000_0000;
-
- always @(posedge clk or negedge nReset)
- if (!nReset)
- begin
- c_state <= #1 idle;
- cmd_ack <= #1 1'b0;
- scl_oen <= #1 1'b1;
- sda_oen <= #1 1'b1;
- sda_chk <= #1 1'b0;
- end
- else if (rst | al)
- begin
- c_state <= #1 idle;
- cmd_ack <= #1 1'b0;
- scl_oen <= #1 1'b1;
- sda_oen <= #1 1'b1;
- sda_chk <= #1 1'b0;
- end
- else
- begin
- cmd_ack <= #1 1'b0; // default no command acknowledge + assert cmd_ack only 1clk cycle
-
- if (clk_en)
- case (c_state) // synopsys full_case parallel_case
- // idle state
- idle:
- begin
- case (cmd) // synopsys full_case parallel_case
- `I2C_CMD_START:
- c_state <= #1 start_a;
-
- `I2C_CMD_STOP:
- c_state <= #1 stop_a;
-
- `I2C_CMD_WRITE:
- c_state <= #1 wr_a;
-
- `I2C_CMD_READ:
- c_state <= #1 rd_a;
-
- default:
- c_state <= #1 idle;
- endcase
-
- scl_oen <= #1 scl_oen; // keep SCL in same state
- sda_oen <= #1 sda_oen; // keep SDA in same state
- sda_chk <= #1 1'b0; // don't check SDA output
- end
-
- // start
- start_a:
- begin
- c_state <= #1 start_b;
- scl_oen <= #1 scl_oen; // keep SCL in same state
- sda_oen <= #1 1'b1; // set SDA high
- sda_chk <= #1 1'b0; // don't check SDA output
- end
-
- start_b:
- begin
- c_state <= #1 start_c;
- scl_oen <= #1 1'b1; // set SCL high
- sda_oen <= #1 1'b1; // keep SDA high
- sda_chk <= #1 1'b0; // don't check SDA output
- end
-
- start_c:
- begin
- c_state <= #1 start_d;
- scl_oen <= #1 1'b1; // keep SCL high
- sda_oen <= #1 1'b0; // set SDA low
- sda_chk <= #1 1'b0; // don't check SDA output
- end
-
- start_d:
- begin
- c_state <= #1 start_e;
- scl_oen <= #1 1'b1; // keep SCL high
- sda_oen <= #1 1'b0; // keep SDA low
- sda_chk <= #1 1'b0; // don't check SDA output
- end
-
- start_e:
- begin
- c_state <= #1 idle;
- cmd_ack <= #1 1'b1;
- scl_oen <= #1 1'b0; // set SCL low
- sda_oen <= #1 1'b0; // keep SDA low
- sda_chk <= #1 1'b0; // don't check SDA output
- end
-
- // stop
- stop_a:
- begin
- c_state <= #1 stop_b;
- scl_oen <= #1 1'b0; // keep SCL low
- sda_oen <= #1 1'b0; // set SDA low
- sda_chk <= #1 1'b0; // don't check SDA output
- end
-
- stop_b:
- begin
- c_state <= #1 stop_c;
- scl_oen <= #1 1'b1; // set SCL high
- sda_oen <= #1 1'b0; // keep SDA low
- sda_chk <= #1 1'b0; // don't check SDA output
- end
-
- stop_c:
- begin
- c_state <= #1 stop_d;
- scl_oen <= #1 1'b1; // keep SCL high
- sda_oen <= #1 1'b0; // keep SDA low
- sda_chk <= #1 1'b0; // don't check SDA output
- end
-
- stop_d:
- begin
- c_state <= #1 idle;
- cmd_ack <= #1 1'b1;
- scl_oen <= #1 1'b1; // keep SCL high
- sda_oen <= #1 1'b1; // set SDA high
- sda_chk <= #1 1'b0; // don't check SDA output
- end
-
- // read
- rd_a:
- begin
- c_state <= #1 rd_b;
- scl_oen <= #1 1'b0; // keep SCL low
- sda_oen <= #1 1'b1; // tri-state SDA
- sda_chk <= #1 1'b0; // don't check SDA output
- end
-
- rd_b:
- begin
- c_state <= #1 rd_c;
- scl_oen <= #1 1'b1; // set SCL high
- sda_oen <= #1 1'b1; // keep SDA tri-stated
- sda_chk <= #1 1'b0; // don't check SDA output
- end
-
- rd_c:
- begin
- c_state <= #1 rd_d;
- scl_oen <= #1 1'b1; // keep SCL high
- sda_oen <= #1 1'b1; // keep SDA tri-stated
- sda_chk <= #1 1'b0; // don't check SDA output
- end
-
- rd_d:
- begin
- c_state <= #1 idle;
- cmd_ack <= #1 1'b1;
- scl_oen <= #1 1'b0; // set SCL low
- sda_oen <= #1 1'b1; // keep SDA tri-stated
- sda_chk <= #1 1'b0; // don't check SDA output
- end
-
- // write
- wr_a:
- begin
- c_state <= #1 wr_b;
- scl_oen <= #1 1'b0; // keep SCL low
- sda_oen <= #1 din; // set SDA
- sda_chk <= #1 1'b0; // don't check SDA output (SCL low)
- end
-
- wr_b:
- begin
- c_state <= #1 wr_c;
- scl_oen <= #1 1'b1; // set SCL high
- sda_oen <= #1 din; // keep SDA
- sda_chk <= #1 1'b1; // check SDA output
- end
-
- wr_c:
- begin
- c_state <= #1 wr_d;
- scl_oen <= #1 1'b1; // keep SCL high
- sda_oen <= #1 din;
- sda_chk <= #1 1'b1; // check SDA output
- end
-
- wr_d:
- begin
- c_state <= #1 idle;
- cmd_ack <= #1 1'b1;
- scl_oen <= #1 1'b0; // set SCL low
- sda_oen <= #1 din;
- sda_chk <= #1 1'b0; // don't check SDA output (SCL low)
- end
-
- endcase
- end
-
-
- // assign scl and sda output (always gnd)
- assign scl_o = 1'b0;
- assign sda_o = 1'b0;
-
-endmodule
diff --git a/fpga/usrp2/opencores/i2c/rtl/verilog/i2c_master_byte_ctrl.v b/fpga/usrp2/opencores/i2c/rtl/verilog/i2c_master_byte_ctrl.v
deleted file mode 100644
index d091d1e36..000000000
--- a/fpga/usrp2/opencores/i2c/rtl/verilog/i2c_master_byte_ctrl.v
+++ /dev/null
@@ -1,344 +0,0 @@
-/////////////////////////////////////////////////////////////////////
-//// ////
-//// WISHBONE rev.B2 compliant I2C Master byte-controller ////
-//// ////
-//// ////
-//// Author: Richard Herveille ////
-//// richard@asics.ws ////
-//// www.asics.ws ////
-//// ////
-//// Downloaded from: http://www.opencores.org/projects/i2c/ ////
-//// ////
-/////////////////////////////////////////////////////////////////////
-//// ////
-//// Copyright (C) 2001 Richard Herveille ////
-//// richard@asics.ws ////
-//// ////
-//// This source file may be used and distributed without ////
-//// restriction provided that this copyright statement is not ////
-//// removed from the file and that any derivative work contains ////
-//// the original copyright notice and the associated disclaimer.////
-//// ////
-//// THIS SOFTWARE IS PROVIDED ``AS IS'' AND WITHOUT ANY ////
-//// EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED ////
-//// TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS ////
-//// FOR A PARTICULAR PURPOSE. IN NO EVENT SHALL THE AUTHOR ////
-//// OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, ////
-//// INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES ////
-//// (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE ////
-//// GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR ////
-//// BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF ////
-//// LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT ////
-//// (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT ////
-//// OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE ////
-//// POSSIBILITY OF SUCH DAMAGE. ////
-//// ////
-/////////////////////////////////////////////////////////////////////
-
-// CVS Log
-//
-// $Id: i2c_master_byte_ctrl.v,v 1.7 2004/02/18 11:40:46 rherveille Exp $
-//
-// $Date: 2004/02/18 11:40:46 $
-// $Revision: 1.7 $
-// $Author: rherveille $
-// $Locker: $
-// $State: Exp $
-//
-// Change History:
-// $Log: i2c_master_byte_ctrl.v,v $
-// Revision 1.7 2004/02/18 11:40:46 rherveille
-// Fixed a potential bug in the statemachine. During a 'stop' 2 cmd_ack signals were generated. Possibly canceling a new start command.
-//
-// Revision 1.6 2003/08/09 07:01:33 rherveille
-// Fixed a bug in the Arbitration Lost generation caused by delay on the (external) sda line.
-// Fixed a potential bug in the byte controller's host-acknowledge generation.
-//
-// Revision 1.5 2002/12/26 15:02:32 rherveille
-// Core is now a Multimaster I2C controller
-//
-// Revision 1.4 2002/11/30 22:24:40 rherveille
-// Cleaned up code
-//
-// Revision 1.3 2001/11/05 11:59:25 rherveille
-// Fixed wb_ack_o generation bug.
-// Fixed bug in the byte_controller statemachine.
-// Added headers.
-//
-
-// synopsys translate_off
-`include "timescale.v"
-// synopsys translate_on
-
-`include "i2c_master_defines.v"
-
-module i2c_master_byte_ctrl (
- clk, rst, nReset, ena, clk_cnt, start, stop, read, write, ack_in, din,
- cmd_ack, ack_out, dout, i2c_busy, i2c_al, scl_i, scl_o, scl_oen, sda_i, sda_o, sda_oen );
-
- //
- // inputs & outputs
- //
- input clk; // master clock
- input rst; // synchronous active high reset
- input nReset; // asynchronous active low reset
- input ena; // core enable signal
-
- input [15:0] clk_cnt; // 4x SCL
-
- // control inputs
- input start;
- input stop;
- input read;
- input write;
- input ack_in;
- input [7:0] din;
-
- // status outputs
- output cmd_ack;
- reg cmd_ack;
- output ack_out;
- reg ack_out;
- output i2c_busy;
- output i2c_al;
- output [7:0] dout;
-
- // I2C signals
- input scl_i;
- output scl_o;
- output scl_oen;
- input sda_i;
- output sda_o;
- output sda_oen;
-
-
- //
- // Variable declarations
- //
-
- // statemachine
- parameter [4:0] ST_IDLE = 5'b0_0000;
- parameter [4:0] ST_START = 5'b0_0001;
- parameter [4:0] ST_READ = 5'b0_0010;
- parameter [4:0] ST_WRITE = 5'b0_0100;
- parameter [4:0] ST_ACK = 5'b0_1000;
- parameter [4:0] ST_STOP = 5'b1_0000;
-
- // signals for bit_controller
- reg [3:0] core_cmd;
- reg core_txd;
- wire core_ack, core_rxd;
-
- // signals for shift register
- reg [7:0] sr; //8bit shift register
- reg shift, ld;
-
- // signals for state machine
- wire go;
- reg [2:0] dcnt;
- wire cnt_done;
-
- //
- // Module body
- //
-
- // hookup bit_controller
- i2c_master_bit_ctrl bit_controller (
- .clk ( clk ),
- .rst ( rst ),
- .nReset ( nReset ),
- .ena ( ena ),
- .clk_cnt ( clk_cnt ),
- .cmd ( core_cmd ),
- .cmd_ack ( core_ack ),
- .busy ( i2c_busy ),
- .al ( i2c_al ),
- .din ( core_txd ),
- .dout ( core_rxd ),
- .scl_i ( scl_i ),
- .scl_o ( scl_o ),
- .scl_oen ( scl_oen ),
- .sda_i ( sda_i ),
- .sda_o ( sda_o ),
- .sda_oen ( sda_oen )
- );
-
- // generate go-signal
- assign go = (read | write | stop) & ~cmd_ack;
-
- // assign dout output to shift-register
- assign dout = sr;
-
- // generate shift register
- always @(posedge clk or negedge nReset)
- if (!nReset)
- sr <= #1 8'h0;
- else if (rst)
- sr <= #1 8'h0;
- else if (ld)
- sr <= #1 din;
- else if (shift)
- sr <= #1 {sr[6:0], core_rxd};
-
- // generate counter
- always @(posedge clk or negedge nReset)
- if (!nReset)
- dcnt <= #1 3'h0;
- else if (rst)
- dcnt <= #1 3'h0;
- else if (ld)
- dcnt <= #1 3'h7;
- else if (shift)
- dcnt <= #1 dcnt - 3'h1;
-
- assign cnt_done = ~(|dcnt);
-
- //
- // state machine
- //
- reg [4:0] c_state; // synopsis enum_state
-
- always @(posedge clk or negedge nReset)
- if (!nReset)
- begin
- core_cmd <= #1 `I2C_CMD_NOP;
- core_txd <= #1 1'b0;
- shift <= #1 1'b0;
- ld <= #1 1'b0;
- cmd_ack <= #1 1'b0;
- c_state <= #1 ST_IDLE;
- ack_out <= #1 1'b0;
- end
- else if (rst | i2c_al)
- begin
- core_cmd <= #1 `I2C_CMD_NOP;
- core_txd <= #1 1'b0;
- shift <= #1 1'b0;
- ld <= #1 1'b0;
- cmd_ack <= #1 1'b0;
- c_state <= #1 ST_IDLE;
- ack_out <= #1 1'b0;
- end
- else
- begin
- // initially reset all signals
- core_txd <= #1 sr[7];
- shift <= #1 1'b0;
- ld <= #1 1'b0;
- cmd_ack <= #1 1'b0;
-
- case (c_state) // synopsys full_case parallel_case
- ST_IDLE:
- if (go)
- begin
- if (start)
- begin
- c_state <= #1 ST_START;
- core_cmd <= #1 `I2C_CMD_START;
- end
- else if (read)
- begin
- c_state <= #1 ST_READ;
- core_cmd <= #1 `I2C_CMD_READ;
- end
- else if (write)
- begin
- c_state <= #1 ST_WRITE;
- core_cmd <= #1 `I2C_CMD_WRITE;
- end
- else // stop
- begin
- c_state <= #1 ST_STOP;
- core_cmd <= #1 `I2C_CMD_STOP;
- end
-
- ld <= #1 1'b1;
- end
-
- ST_START:
- if (core_ack)
- begin
- if (read)
- begin
- c_state <= #1 ST_READ;
- core_cmd <= #1 `I2C_CMD_READ;
- end
- else
- begin
- c_state <= #1 ST_WRITE;
- core_cmd <= #1 `I2C_CMD_WRITE;
- end
-
- ld <= #1 1'b1;
- end
-
- ST_WRITE:
- if (core_ack)
- if (cnt_done)
- begin
- c_state <= #1 ST_ACK;
- core_cmd <= #1 `I2C_CMD_READ;
- end
- else
- begin
- c_state <= #1 ST_WRITE; // stay in same state
- core_cmd <= #1 `I2C_CMD_WRITE; // write next bit
- shift <= #1 1'b1;
- end
-
- ST_READ:
- if (core_ack)
- begin
- if (cnt_done)
- begin
- c_state <= #1 ST_ACK;
- core_cmd <= #1 `I2C_CMD_WRITE;
- end
- else
- begin
- c_state <= #1 ST_READ; // stay in same state
- core_cmd <= #1 `I2C_CMD_READ; // read next bit
- end
-
- shift <= #1 1'b1;
- core_txd <= #1 ack_in;
- end
-
- ST_ACK:
- if (core_ack)
- begin
- if (stop)
- begin
- c_state <= #1 ST_STOP;
- core_cmd <= #1 `I2C_CMD_STOP;
- end
- else
- begin
- c_state <= #1 ST_IDLE;
- core_cmd <= #1 `I2C_CMD_NOP;
-
- // generate command acknowledge signal
- cmd_ack <= #1 1'b1;
- end
-
- // assign ack_out output to bit_controller_rxd (contains last received bit)
- ack_out <= #1 core_rxd;
-
- core_txd <= #1 1'b1;
- end
- else
- core_txd <= #1 ack_in;
-
- ST_STOP:
- if (core_ack)
- begin
- c_state <= #1 ST_IDLE;
- core_cmd <= #1 `I2C_CMD_NOP;
-
- // generate command acknowledge signal
- cmd_ack <= #1 1'b1;
- end
-
- endcase
- end
-endmodule
diff --git a/fpga/usrp2/opencores/i2c/rtl/verilog/i2c_master_defines.v b/fpga/usrp2/opencores/i2c/rtl/verilog/i2c_master_defines.v
deleted file mode 100644
index ee3b694fa..000000000
--- a/fpga/usrp2/opencores/i2c/rtl/verilog/i2c_master_defines.v
+++ /dev/null
@@ -1,64 +0,0 @@
-/////////////////////////////////////////////////////////////////////
-//// ////
-//// WISHBONE rev.B2 compliant I2C Master controller defines ////
-//// ////
-//// ////
-//// Author: Richard Herveille ////
-//// richard@asics.ws ////
-//// www.asics.ws ////
-//// ////
-//// Downloaded from: http://www.opencores.org/projects/i2c/ ////
-//// ////
-/////////////////////////////////////////////////////////////////////
-//// ////
-//// Copyright (C) 2001 Richard Herveille ////
-//// richard@asics.ws ////
-//// ////
-//// This source file may be used and distributed without ////
-//// restriction provided that this copyright statement is not ////
-//// removed from the file and that any derivative work contains ////
-//// the original copyright notice and the associated disclaimer.////
-//// ////
-//// THIS SOFTWARE IS PROVIDED ``AS IS'' AND WITHOUT ANY ////
-//// EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED ////
-//// TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS ////
-//// FOR A PARTICULAR PURPOSE. IN NO EVENT SHALL THE AUTHOR ////
-//// OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, ////
-//// INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES ////
-//// (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE ////
-//// GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR ////
-//// BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF ////
-//// LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT ////
-//// (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT ////
-//// OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE ////
-//// POSSIBILITY OF SUCH DAMAGE. ////
-//// ////
-/////////////////////////////////////////////////////////////////////
-
-// CVS Log
-//
-// $Id: i2c_master_defines.v,v 1.3 2001/11/05 11:59:25 rherveille Exp $
-//
-// $Date: 2001/11/05 11:59:25 $
-// $Revision: 1.3 $
-// $Author: rherveille $
-// $Locker: $
-// $State: Exp $
-//
-// Change History:
-// $Log: i2c_master_defines.v,v $
-// Revision 1.3 2001/11/05 11:59:25 rherveille
-// Fixed wb_ack_o generation bug.
-// Fixed bug in the byte_controller statemachine.
-// Added headers.
-//
-
-
-// I2C registers wishbone addresses
-
-// bitcontroller states
-`define I2C_CMD_NOP 4'b0000
-`define I2C_CMD_START 4'b0001
-`define I2C_CMD_STOP 4'b0010
-`define I2C_CMD_WRITE 4'b0100
-`define I2C_CMD_READ 4'b1000
diff --git a/fpga/usrp2/opencores/i2c/rtl/verilog/i2c_master_top.v b/fpga/usrp2/opencores/i2c/rtl/verilog/i2c_master_top.v
deleted file mode 100644
index 30689bd70..000000000
--- a/fpga/usrp2/opencores/i2c/rtl/verilog/i2c_master_top.v
+++ /dev/null
@@ -1,301 +0,0 @@
-/////////////////////////////////////////////////////////////////////
-//// ////
-//// WISHBONE revB.2 compliant I2C Master controller Top-level ////
-//// ////
-//// ////
-//// Author: Richard Herveille ////
-//// richard@asics.ws ////
-//// www.asics.ws ////
-//// ////
-//// Downloaded from: http://www.opencores.org/projects/i2c/ ////
-//// ////
-/////////////////////////////////////////////////////////////////////
-//// ////
-//// Copyright (C) 2001 Richard Herveille ////
-//// richard@asics.ws ////
-//// ////
-//// This source file may be used and distributed without ////
-//// restriction provided that this copyright statement is not ////
-//// removed from the file and that any derivative work contains ////
-//// the original copyright notice and the associated disclaimer.////
-//// ////
-//// THIS SOFTWARE IS PROVIDED ``AS IS'' AND WITHOUT ANY ////
-//// EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED ////
-//// TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS ////
-//// FOR A PARTICULAR PURPOSE. IN NO EVENT SHALL THE AUTHOR ////
-//// OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, ////
-//// INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES ////
-//// (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE ////
-//// GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR ////
-//// BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF ////
-//// LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT ////
-//// (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT ////
-//// OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE ////
-//// POSSIBILITY OF SUCH DAMAGE. ////
-//// ////
-/////////////////////////////////////////////////////////////////////
-
-// CVS Log
-//
-// $Id: i2c_master_top.v,v 1.11 2005/02/27 09:26:24 rherveille Exp $
-//
-// $Date: 2005/02/27 09:26:24 $
-// $Revision: 1.11 $
-// $Author: rherveille $
-// $Locker: $
-// $State: Exp $
-//
-// Change History:
-// $Log: i2c_master_top.v,v $
-// Revision 1.11 2005/02/27 09:26:24 rherveille
-// Fixed register overwrite issue.
-// Removed full_case pragma, replaced it by a default statement.
-//
-// Revision 1.10 2003/09/01 10:34:38 rherveille
-// Fix a blocking vs. non-blocking error in the wb_dat output mux.
-//
-// Revision 1.9 2003/01/09 16:44:45 rherveille
-// Fixed a bug in the Command Register declaration.
-//
-// Revision 1.8 2002/12/26 16:05:12 rherveille
-// Small code simplifications
-//
-// Revision 1.7 2002/12/26 15:02:32 rherveille
-// Core is now a Multimaster I2C controller
-//
-// Revision 1.6 2002/11/30 22:24:40 rherveille
-// Cleaned up code
-//
-// Revision 1.5 2001/11/10 10:52:55 rherveille
-// Changed PRER reset value from 0x0000 to 0xffff, conform specs.
-//
-
-// synopsys translate_off
-`include "timescale.v"
-// synopsys translate_on
-
-`include "i2c_master_defines.v"
-
-module i2c_master_top(
- wb_clk_i, wb_rst_i, arst_i, wb_adr_i, wb_dat_i, wb_dat_o,
- wb_we_i, wb_stb_i, wb_cyc_i, wb_ack_o, wb_inta_o,
- scl_pad_i, scl_pad_o, scl_padoen_o, sda_pad_i, sda_pad_o, sda_padoen_o );
-
- // parameters
- parameter ARST_LVL = 1'b0; // asynchronous reset level
-
- //
- // inputs & outputs
- //
-
- // wishbone signals
- input wb_clk_i; // master clock input
- input wb_rst_i; // synchronous active high reset
- input arst_i; // asynchronous reset
- input [2:0] wb_adr_i; // lower address bits
- input [7:0] wb_dat_i; // databus input
- output [7:0] wb_dat_o; // databus output
- input wb_we_i; // write enable input
- input wb_stb_i; // stobe/core select signal
- input wb_cyc_i; // valid bus cycle input
- output wb_ack_o; // bus cycle acknowledge output
- output wb_inta_o; // interrupt request signal output
-
- reg [7:0] wb_dat_o;
- reg wb_ack_o;
- reg wb_inta_o;
-
- // I2C signals
- // i2c clock line
- input scl_pad_i; // SCL-line input
- output scl_pad_o; // SCL-line output (always 1'b0)
- output scl_padoen_o; // SCL-line output enable (active low)
-
- // i2c data line
- input sda_pad_i; // SDA-line input
- output sda_pad_o; // SDA-line output (always 1'b0)
- output sda_padoen_o; // SDA-line output enable (active low)
-
-
- //
- // variable declarations
- //
-
- // registers
- reg [15:0] prer; // clock prescale register
- reg [ 7:0] ctr; // control register
- reg [ 7:0] txr; // transmit register
- wire [ 7:0] rxr; // receive register
- reg [ 7:0] cr; // command register
- wire [ 7:0] sr; // status register
-
- // done signal: command completed, clear command register
- wire done;
-
- // core enable signal
- wire core_en;
- wire ien;
-
- // status register signals
- wire irxack;
- reg rxack; // received aknowledge from slave
- reg tip; // transfer in progress
- reg irq_flag; // interrupt pending flag
- wire i2c_busy; // bus busy (start signal detected)
- wire i2c_al; // i2c bus arbitration lost
- reg al; // status register arbitration lost bit
-
- //
- // module body
- //
-
- // generate internal reset
- wire rst_i = arst_i ^ ARST_LVL;
-
- // generate wishbone signals
- wire wb_wacc = wb_cyc_i & wb_stb_i & wb_we_i;
-
- // generate acknowledge output signal
- always @(posedge wb_clk_i)
- wb_ack_o <= #1 wb_cyc_i & wb_stb_i & ~wb_ack_o; // because timing is always honored
-
- // assign DAT_O
- always @(posedge wb_clk_i)
- begin
- case (wb_adr_i) // synopsis parallel_case
- 3'b000: wb_dat_o <= #1 prer[ 7:0];
- 3'b001: wb_dat_o <= #1 prer[15:8];
- 3'b010: wb_dat_o <= #1 ctr;
- 3'b011: wb_dat_o <= #1 rxr; // write is transmit register (txr)
- 3'b100: wb_dat_o <= #1 sr; // write is command register (cr)
- 3'b101: wb_dat_o <= #1 txr;
- 3'b110: wb_dat_o <= #1 cr;
- 3'b111: wb_dat_o <= #1 0; // reserved
- endcase
- end
-
- // generate registers
- always @(posedge wb_clk_i or negedge rst_i)
- if (!rst_i)
- begin
- prer <= #1 16'hffff;
- ctr <= #1 8'h0;
- txr <= #1 8'h0;
- end
- else if (wb_rst_i)
- begin
- prer <= #1 16'hffff;
- ctr <= #1 8'h0;
- txr <= #1 8'h0;
- end
- else
- if (wb_wacc)
- case (wb_adr_i) // synopsis parallel_case
- 3'b000 : prer [ 7:0] <= #1 wb_dat_i;
- 3'b001 : prer [15:8] <= #1 wb_dat_i;
- 3'b010 : ctr <= #1 wb_dat_i;
- 3'b011 : txr <= #1 wb_dat_i;
- default: ;
- endcase
-
- // generate command register (special case)
- always @(posedge wb_clk_i or negedge rst_i)
- if (~rst_i)
- cr <= #1 8'h0;
- else if (wb_rst_i)
- cr <= #1 8'h0;
- else if (wb_wacc)
- begin
- if (core_en & (wb_adr_i == 3'b100) )
- cr <= #1 wb_dat_i;
- end
- else
- begin
- if (done | i2c_al)
- cr[7:4] <= #1 4'h0; // clear command bits when done
- // or when aribitration lost
- cr[2:1] <= #1 2'b0; // reserved bits
- cr[0] <= #1 2'b0; // clear IRQ_ACK bit
- end
-
-
- // decode command register
- wire sta = cr[7];
- wire sto = cr[6];
- wire rd = cr[5];
- wire wr = cr[4];
- wire ack = cr[3];
- wire iack = cr[0];
-
- // decode control register
- assign core_en = ctr[7];
- assign ien = ctr[6];
-
- // hookup byte controller block
- i2c_master_byte_ctrl byte_controller (
- .clk ( wb_clk_i ),
- .rst ( wb_rst_i ),
- .nReset ( rst_i ),
- .ena ( core_en ),
- .clk_cnt ( prer ),
- .start ( sta ),
- .stop ( sto ),
- .read ( rd ),
- .write ( wr ),
- .ack_in ( ack ),
- .din ( txr ),
- .cmd_ack ( done ),
- .ack_out ( irxack ),
- .dout ( rxr ),
- .i2c_busy ( i2c_busy ),
- .i2c_al ( i2c_al ),
- .scl_i ( scl_pad_i ),
- .scl_o ( scl_pad_o ),
- .scl_oen ( scl_padoen_o ),
- .sda_i ( sda_pad_i ),
- .sda_o ( sda_pad_o ),
- .sda_oen ( sda_padoen_o )
- );
-
- // status register block + interrupt request signal
- always @(posedge wb_clk_i or negedge rst_i)
- if (!rst_i)
- begin
- al <= #1 1'b0;
- rxack <= #1 1'b0;
- tip <= #1 1'b0;
- irq_flag <= #1 1'b0;
- end
- else if (wb_rst_i)
- begin
- al <= #1 1'b0;
- rxack <= #1 1'b0;
- tip <= #1 1'b0;
- irq_flag <= #1 1'b0;
- end
- else
- begin
- al <= #1 i2c_al | (al & ~sta);
- rxack <= #1 irxack;
- tip <= #1 (rd | wr);
- irq_flag <= #1 (done | i2c_al | irq_flag) & ~iack; // interrupt request flag is always generated
- end
-
- // generate interrupt request signals
- always @(posedge wb_clk_i or negedge rst_i)
- if (!rst_i)
- wb_inta_o <= #1 1'b0;
- else if (wb_rst_i)
- wb_inta_o <= #1 1'b0;
- else
- wb_inta_o <= #1 irq_flag && ien; // interrupt signal is only generated when IEN (interrupt enable bit is set)
-
- // assign status register bits
- assign sr[7] = rxack;
- assign sr[6] = i2c_busy;
- assign sr[5] = al;
- assign sr[4:2] = 3'h0; // reserved
- assign sr[1] = tip;
- assign sr[0] = irq_flag;
-
-endmodule
diff --git a/fpga/usrp2/opencores/i2c/rtl/verilog/timescale.v b/fpga/usrp2/opencores/i2c/rtl/verilog/timescale.v
deleted file mode 100644
index 60d4ecbd1..000000000
--- a/fpga/usrp2/opencores/i2c/rtl/verilog/timescale.v
+++ /dev/null
@@ -1,2 +0,0 @@
-`timescale 1ns / 10ps
-
diff --git a/fpga/usrp2/opencores/i2c/rtl/vhdl/I2C.VHD b/fpga/usrp2/opencores/i2c/rtl/vhdl/I2C.VHD
deleted file mode 100644
index 64d1eb656..000000000
--- a/fpga/usrp2/opencores/i2c/rtl/vhdl/I2C.VHD
+++ /dev/null
@@ -1,620 +0,0 @@
---
--- Simple I2C controller
---
--- 1) No multimaster
--- 2) No slave mode
--- 3) No fifo's
---
--- notes:
--- Every command is acknowledged. Do not set a new command before previous is acknowledged.
--- Dout is available 1 clock cycle later as cmd_ack
---
-
-library ieee;
-use ieee.std_logic_1164.all;
-use ieee.std_logic_arith.all;
-
-package I2C is
- component simple_i2c is
- port (
- clk : in std_logic;
- ena : in std_logic;
- nReset : in std_logic;
-
- clk_cnt : in unsigned(7 downto 0); -- 4x SCL
-
- -- input signals
- start,
- stop,
- read,
- write,
- ack_in : std_logic;
- Din : in std_logic_vector(7 downto 0);
-
- -- output signals
- cmd_ack : out std_logic;
- ack_out : out std_logic;
- Dout : out std_logic_vector(7 downto 0);
-
- -- i2c signals
- SCL : inout std_logic;
- SDA : inout std_logic
- );
- end component simple_i2c;
-end package I2C;
-
-
-library ieee;
-use ieee.std_logic_1164.all;
-use ieee.std_logic_arith.all;
-
-entity simple_i2c is
- port (
- clk : in std_logic;
- ena : in std_logic;
- nReset : in std_logic;
-
- clk_cnt : in unsigned(7 downto 0); -- 4x SCL
-
- -- input signals
- start,
- stop,
- read,
- write,
- ack_in : std_logic;
- Din : in std_logic_vector(7 downto 0);
-
- -- output signals
- cmd_ack : out std_logic;
- ack_out : out std_logic;
- Dout : out std_logic_vector(7 downto 0);
-
- -- i2c signals
- SCL : inout std_logic;
- SDA : inout std_logic
- );
-end entity simple_i2c;
-
-architecture structural of simple_i2c is
- component i2c_core is
- port (
- clk : in std_logic;
- nReset : in std_logic;
-
- clk_cnt : in unsigned(7 downto 0);
-
- cmd : in std_logic_vector(2 downto 0);
- cmd_ack : out std_logic;
- busy : out std_logic;
-
- Din : in std_logic;
- Dout : out std_logic;
-
- SCL : inout std_logic;
- SDA : inout std_logic
- );
- end component i2c_core;
-
- -- commands for i2c_core
- constant CMD_NOP : std_logic_vector(2 downto 0) := "000";
- constant CMD_START : std_logic_vector(2 downto 0) := "010";
- constant CMD_STOP : std_logic_vector(2 downto 0) := "011";
- constant CMD_READ : std_logic_vector(2 downto 0) := "100";
- constant CMD_WRITE : std_logic_vector(2 downto 0) := "101";
-
- -- signals for i2c_core
- signal core_cmd : std_logic_vector(2 downto 0);
- signal core_ack, core_busy, core_txd, core_rxd : std_logic;
-
- -- signals for shift register
- signal sr : std_logic_vector(7 downto 0); -- 8bit shift register
- signal shift, ld : std_logic;
-
- -- signals for state machine
- signal go, host_ack : std_logic;
-begin
- -- hookup i2c core
- u1: i2c_core port map (clk, nReset, clk_cnt, core_cmd, core_ack, core_busy, core_txd, core_rxd, SCL, SDA);
-
- -- generate host-command-acknowledge
- cmd_ack <= host_ack;
-
- -- generate go-signal
- go <= (read or write) and not host_ack;
-
- -- assign Dout output to shift-register
- Dout <= sr;
-
- -- assign ack_out output to core_rxd (contains last received bit)
- ack_out <= core_rxd;
-
- -- generate shift register
- shift_register: process(clk)
- begin
- if (clk'event and clk = '1') then
- if (ld = '1') then
- sr <= din;
- elsif (shift = '1') then
- sr <= (sr(6 downto 0) & core_rxd);
- end if;
- end if;
- end process shift_register;
-
- --
- -- state machine
- --
- statemachine : block
- type states is (st_idle, st_start, st_read, st_write, st_ack, st_stop);
- signal state : states;
- signal dcnt : unsigned(2 downto 0);
- begin
- --
- -- command interpreter, translate complex commands into simpler I2C commands
- --
- nxt_state_decoder: process(clk, nReset, state)
- variable nxt_state : states;
- variable idcnt : unsigned(2 downto 0);
- variable ihost_ack : std_logic;
- variable icore_cmd : std_logic_vector(2 downto 0);
- variable icore_txd : std_logic;
- variable ishift, iload : std_logic;
- begin
- -- 8 databits (1byte) of data to shift-in/out
- idcnt := dcnt;
-
- -- no acknowledge (until command complete)
- ihost_ack := '0';
-
- icore_txd := core_txd;
-
- -- keep current command to i2c_core
- icore_cmd := core_cmd;
-
- -- no shifting or loading of shift-register
- ishift := '0';
- iload := '0';
-
- -- keep current state;
- nxt_state := state;
- case state is
- when st_idle =>
- if (go = '1') then
- if (start = '1') then
- nxt_state := st_start;
- icore_cmd := CMD_START;
- elsif (read = '1') then
- nxt_state := st_read;
- icore_cmd := CMD_READ;
- idcnt := "111";
- else
- nxt_state := st_write;
- icore_cmd := CMD_WRITE;
- idcnt := "111";
- iload := '1';
- end if;
- end if;
-
- when st_start =>
- if (core_ack = '1') then
- if (read = '1') then
- nxt_state := st_read;
- icore_cmd := CMD_READ;
- idcnt := "111";
- else
- nxt_state := st_write;
- icore_cmd := CMD_WRITE;
- idcnt := "111";
- iload := '1';
- end if;
- end if;
-
- when st_write =>
- if (core_ack = '1') then
- idcnt := dcnt -1; -- count down Data_counter
- icore_txd := sr(7);
- if (dcnt = 0) then
- nxt_state := st_ack;
- icore_cmd := CMD_READ;
- else
- ishift := '1';
--- icore_txd := sr(7);
- end if;
- end if;
-
- when st_read =>
- if (core_ack = '1') then
- idcnt := dcnt -1; -- count down Data_counter
- ishift := '1';
- if (dcnt = 0) then
- nxt_state := st_ack;
- icore_cmd := CMD_WRITE;
- icore_txd := ack_in;
- end if;
- end if;
-
- when st_ack =>
- if (core_ack = '1') then
- -- generate command acknowledge signal
- ihost_ack := '1';
-
- -- Perform an additional shift, needed for 'read' (store last received bit in shift register)
- ishift := '1';
-
- -- check for stop; Should a STOP command be generated ?
- if (stop = '1') then
- nxt_state := st_stop;
- icore_cmd := CMD_STOP;
- else
- nxt_state := st_idle;
- icore_cmd := CMD_NOP;
- end if;
- end if;
-
- when st_stop =>
- if (core_ack = '1') then
- nxt_state := st_idle;
- icore_cmd := CMD_NOP;
- end if;
-
- when others => -- illegal states
- nxt_state := st_idle;
- icore_cmd := CMD_NOP;
- end case;
-
- -- generate registers
- if (nReset = '0') then
- core_cmd <= CMD_NOP;
- core_txd <= '0';
-
- shift <= '0';
- ld <= '0';
-
- dcnt <= "111";
- host_ack <= '0';
-
- state <= st_idle;
- elsif (clk'event and clk = '1') then
- if (ena = '1') then
- state <= nxt_state;
-
- dcnt <= idcnt;
- shift <= ishift;
- ld <= iload;
-
- core_cmd <= icore_cmd;
- core_txd <= icore_txd;
-
- host_ack <= ihost_ack;
- end if;
- end if;
- end process nxt_state_decoder;
-
- end block statemachine;
-
-end architecture structural;
-
-
---
---
--- I2C Core
---
--- Translate simple commands into SCL/SDA transitions
--- Each command has 5 states, A/B/C/D/idle
---
--- start: SCL ~~~~~~~~~~\____
--- SDA ~~~~~~~~\______
--- x | A | B | C | D | i
---
--- repstart SCL ____/~~~~\___
--- SDA __/~~~\______
--- x | A | B | C | D | i
---
--- stop SCL ____/~~~~~~~~
--- SDA ==\____/~~~~~
--- x | A | B | C | D | i
---
---- write SCL ____/~~~~\____
--- SDA ==X=========X=
--- x | A | B | C | D | i
---
---- read SCL ____/~~~~\____
--- SDA XXXX=====XXXX
--- x | A | B | C | D | i
---
-
--- Timing: Normal mode Fast mode
------------------------------------------------------------------
--- Fscl 100KHz 400KHz
--- Th_scl 4.0us 0.6us High period of SCL
--- Tl_scl 4.7us 1.3us Low period of SCL
--- Tsu:sta 4.7us 0.6us setup time for a repeated start condition
--- Tsu:sto 4.0us 0.6us setup time for a stop conditon
--- Tbuf 4.7us 1.3us Bus free time between a stop and start condition
---
-
-library ieee;
-use ieee.std_logic_1164.all;
-use ieee.std_logic_arith.all;
-
-entity i2c_core is
- port (
- clk : in std_logic;
- nReset : in std_logic;
-
- clk_cnt : in unsigned(7 downto 0);
-
- cmd : in std_logic_vector(2 downto 0);
- cmd_ack : out std_logic;
- busy : out std_logic;
-
- Din : in std_logic;
- Dout : out std_logic;
-
- SCL : inout std_logic;
- SDA : inout std_logic
- );
-end entity i2c_core;
-
-architecture structural of i2c_core is
- constant CMD_NOP : std_logic_vector(2 downto 0) := "000";
- constant CMD_START : std_logic_vector(2 downto 0) := "010";
- constant CMD_STOP : std_logic_vector(2 downto 0) := "011";
- constant CMD_READ : std_logic_vector(2 downto 0) := "100";
- constant CMD_WRITE : std_logic_vector(2 downto 0) := "101";
-
- type cmds is (idle, start_a, start_b, start_c, start_d, stop_a, stop_b, stop_c, rd_a, rd_b, rd_c, rd_d, wr_a, wr_b, wr_c, wr_d);
- signal state : cmds;
- signal SDAo, SCLo : std_logic;
- signal txd : std_logic;
- signal clk_en, slave_wait :std_logic;
- signal cnt : unsigned(7 downto 0) := clk_cnt;
-begin
- -- whenever the slave is not ready it can delay the cycle by pulling SCL low
- slave_wait <= '1' when ((SCLo = '1') and (SCL = '0')) else '0';
-
- -- generate clk enable signal
- gen_clken: process(clk, nReset)
- begin
- if (nReset = '0') then
- cnt <= (others => '0');
- clk_en <= '1'; --'0';
- elsif (clk'event and clk = '1') then
- if (cnt = 0) then
- clk_en <= '1';
- cnt <= clk_cnt;
- else
- if (slave_wait = '0') then
- cnt <= cnt -1;
- end if;
- clk_en <= '0';
- end if;
- end if;
- end process gen_clken;
-
- -- generate statemachine
- nxt_state_decoder : process (clk, nReset, state, cmd, SDA)
- variable nxt_state : cmds;
- variable icmd_ack, ibusy, store_sda : std_logic;
- variable itxd : std_logic;
- begin
-
- nxt_state := state;
-
- icmd_ack := '0'; -- default no acknowledge
- ibusy := '1'; -- default busy
-
- store_sda := '0';
-
- itxd := txd;
-
- case (state) is
- -- idle
- when idle =>
- case cmd is
- when CMD_START =>
- nxt_state := start_a;
- icmd_ack := '1'; -- command completed
-
- when CMD_STOP =>
- nxt_state := stop_a;
- icmd_ack := '1'; -- command completed
-
- when CMD_WRITE =>
- nxt_state := wr_a;
- icmd_ack := '1'; -- command completed
- itxd := Din;
-
- when CMD_READ =>
- nxt_state := rd_a;
- icmd_ack := '1'; -- command completed
-
- when others =>
- nxt_state := idle;
--- don't acknowledge NOP command icmd_ack := '1'; -- command completed
- ibusy := '0';
- end case;
-
- -- start
- when start_a =>
- nxt_state := start_b;
-
- when start_b =>
- nxt_state := start_c;
-
- when start_c =>
- nxt_state := start_d;
-
- when start_d =>
- nxt_state := idle;
- ibusy := '0'; -- not busy when idle
-
-
- -- stop
- when stop_a =>
- nxt_state := stop_b;
-
- when stop_b =>
- nxt_state := stop_c;
-
- when stop_c =>
--- nxt_state := stop_d;
-
--- when stop_d =>
- nxt_state := idle;
- ibusy := '0'; -- not busy when idle
-
- -- read
- when rd_a =>
- nxt_state := rd_b;
-
- when rd_b =>
- nxt_state := rd_c;
-
- when rd_c =>
- nxt_state := rd_d;
- store_sda := '1';
-
- when rd_d =>
- nxt_state := idle;
- ibusy := '0'; -- not busy when idle
-
- -- write
- when wr_a =>
- nxt_state := wr_b;
-
- when wr_b =>
- nxt_state := wr_c;
-
- when wr_c =>
- nxt_state := wr_d;
-
- when wr_d =>
- nxt_state := idle;
- ibusy := '0'; -- not busy when idle
-
- end case;
-
- -- generate regs
- if (nReset = '0') then
- state <= idle;
- cmd_ack <= '0';
- busy <= '0';
- txd <= '0';
- Dout <= '0';
- elsif (clk'event and clk = '1') then
- if (clk_en = '1') then
- state <= nxt_state;
- busy <= ibusy;
-
- txd <= itxd;
- if (store_sda = '1') then
- Dout <= SDA;
- end if;
- end if;
-
- cmd_ack <= icmd_ack and clk_en;
- end if;
- end process nxt_state_decoder;
-
- --
- -- convert states to SCL and SDA signals
- --
- output_decoder: process (clk, nReset, state)
- variable iscl, isda : std_logic;
- begin
- case (state) is
- when idle =>
- iscl := SCLo; -- keep SCL in same state
- isda := SDA; -- keep SDA in same state
-
- -- start
- when start_a =>
- iscl := SCLo; -- keep SCL in same state (for repeated start)
- isda := '1'; -- set SDA high
-
- when start_b =>
- iscl := '1'; -- set SCL high
- isda := '1'; -- keep SDA high
-
- when start_c =>
- iscl := '1'; -- keep SCL high
- isda := '0'; -- sel SDA low
-
- when start_d =>
- iscl := '0'; -- set SCL low
- isda := '0'; -- keep SDA low
-
- -- stop
- when stop_a =>
- iscl := '0'; -- keep SCL disabled
- isda := '0'; -- set SDA low
-
- when stop_b =>
- iscl := '1'; -- set SCL high
- isda := '0'; -- keep SDA low
-
- when stop_c =>
- iscl := '1'; -- keep SCL high
- isda := '1'; -- set SDA high
-
- -- write
- when wr_a =>
- iscl := '0'; -- keep SCL low
--- isda := txd; -- set SDA
- isda := Din;
-
- when wr_b =>
- iscl := '1'; -- set SCL high
--- isda := txd; -- set SDA
- isda := Din;
-
- when wr_c =>
- iscl := '1'; -- keep SCL high
--- isda := txd; -- set SDA
- isda := Din;
-
- when wr_d =>
- iscl := '0'; -- set SCL low
--- isda := txd; -- set SDA
- isda := Din;
-
- -- read
- when rd_a =>
- iscl := '0'; -- keep SCL low
- isda := '1'; -- tri-state SDA
-
- when rd_b =>
- iscl := '1'; -- set SCL high
- isda := '1'; -- tri-state SDA
-
- when rd_c =>
- iscl := '1'; -- keep SCL high
- isda := '1'; -- tri-state SDA
-
- when rd_d =>
- iscl := '0'; -- set SCL low
- isda := '1'; -- tri-state SDA
- end case;
-
- -- generate registers
- if (nReset = '0') then
- SCLo <= '1';
- SDAo <= '1';
- elsif (clk'event and clk = '1') then
- if (clk_en = '1') then
- SCLo <= iscl;
- SDAo <= isda;
- end if;
- end if;
- end process output_decoder;
-
- SCL <= '0' when (SCLo = '0') else 'Z'; -- since SCL is externally pulled-up convert a '1' to a 'Z'(tri-state)
- SDA <= '0' when (SDAo = '0') else 'Z'; -- since SDA is externally pulled-up convert a '1' to a 'Z'(tri-state)
--- SCL <= SCLo;
--- SDA <= SDAo;
-
-end architecture structural;
-
-
-
-
diff --git a/fpga/usrp2/opencores/i2c/rtl/vhdl/i2c_master_bit_ctrl.vhd b/fpga/usrp2/opencores/i2c/rtl/vhdl/i2c_master_bit_ctrl.vhd
deleted file mode 100644
index 1b8eb96d2..000000000
--- a/fpga/usrp2/opencores/i2c/rtl/vhdl/i2c_master_bit_ctrl.vhd
+++ /dev/null
@@ -1,495 +0,0 @@
----------------------------------------------------------------------
----- ----
----- WISHBONE revB2 I2C Master Core; bit-controller ----
----- ----
----- ----
----- Author: Richard Herveille ----
----- richard@asics.ws ----
----- www.asics.ws ----
----- ----
----- Downloaded from: http://www.opencores.org/projects/i2c/ ----
----- ----
----------------------------------------------------------------------
----- ----
----- Copyright (C) 2000 Richard Herveille ----
----- richard@asics.ws ----
----- ----
----- This source file may be used and distributed without ----
----- restriction provided that this copyright statement is not ----
----- removed from the file and that any derivative work contains ----
----- the original copyright notice and the associated disclaimer.----
----- ----
----- THIS SOFTWARE IS PROVIDED ``AS IS'' AND WITHOUT ANY ----
----- EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED ----
----- TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS ----
----- FOR A PARTICULAR PURPOSE. IN NO EVENT SHALL THE AUTHOR ----
----- OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, ----
----- INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES ----
----- (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE ----
----- GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR ----
----- BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF ----
----- LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT ----
----- (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT ----
----- OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE ----
----- POSSIBILITY OF SUCH DAMAGE. ----
----- ----
----------------------------------------------------------------------
-
--- CVS Log
---
--- $Id: i2c_master_bit_ctrl.vhd,v 1.14 2006/10/11 12:10:13 rherveille Exp $
---
--- $Date: 2006/10/11 12:10:13 $
--- $Revision: 1.14 $
--- $Author: rherveille $
--- $Locker: $
--- $State: Exp $
---
--- Change History:
--- $Log: i2c_master_bit_ctrl.vhd,v $
--- Revision 1.14 2006/10/11 12:10:13 rherveille
--- Added missing semicolons ';' on endif
---
--- Revision 1.13 2006/10/06 10:48:24 rherveille
--- fixed short scl high pulse after clock stretch
---
--- Revision 1.12 2004/05/07 11:53:31 rherveille
--- Fixed previous fix :) Made a variable vs signal mistake.
---
--- Revision 1.11 2004/05/07 11:04:00 rherveille
--- Fixed a bug where the core would signal an arbitration lost (AL bit set), when another master controls the bus and the other master generates a STOP bit.
---
--- Revision 1.10 2004/02/27 07:49:43 rherveille
--- Fixed a bug in the arbitration-lost signal generation. VHDL version only.
---
--- Revision 1.9 2003/08/12 14:48:37 rherveille
--- Forgot an 'end if' :-/
---
--- Revision 1.8 2003/08/09 07:01:13 rherveille
--- Fixed a bug in the Arbitration Lost generation caused by delay on the (external) sda line.
--- Fixed a potential bug in the byte controller's host-acknowledge generation.
---
--- Revision 1.7 2003/02/05 00:06:02 rherveille
--- Fixed a bug where the core would trigger an erroneous 'arbitration lost' interrupt after being reset, when the reset pulse width < 3 clk cycles.
---
--- Revision 1.6 2003/02/01 02:03:06 rherveille
--- Fixed a few 'arbitration lost' bugs. VHDL version only.
---
--- Revision 1.5 2002/12/26 16:05:47 rherveille
--- Core is now a Multimaster I2C controller.
---
--- Revision 1.4 2002/11/30 22:24:37 rherveille
--- Cleaned up code
---
--- Revision 1.3 2002/10/30 18:09:53 rherveille
--- Fixed some reported minor start/stop generation timing issuess.
---
--- Revision 1.2 2002/06/15 07:37:04 rherveille
--- Fixed a small timing bug in the bit controller.\nAdded verilog simulation environment.
---
--- Revision 1.1 2001/11/05 12:02:33 rherveille
--- Split i2c_master_core.vhd into separate files for each entity; same layout as verilog version.
--- Code updated, is now up-to-date to doc. rev.0.4.
--- Added headers.
---
-
-
---
--------------------------------------
--- Bit controller section
-------------------------------------
---
--- Translate simple commands into SCL/SDA transitions
--- Each command has 5 states, A/B/C/D/idle
---
--- start: SCL ~~~~~~~~~~~~~~\____
--- SDA XX/~~~~~~~\______
--- x | A | B | C | D | i
---
--- repstart SCL ______/~~~~~~~\___
--- SDA __/~~~~~~~\______
--- x | A | B | C | D | i
---
--- stop SCL _______/~~~~~~~~~~~
--- SDA ==\___________/~~~~~
--- x | A | B | C | D | i
---
---- write SCL ______/~~~~~~~\____
--- SDA XXX===============XX
--- x | A | B | C | D | i
---
---- read SCL ______/~~~~~~~\____
--- SDA XXXXXXX=XXXXXXXXXXX
--- x | A | B | C | D | i
---
-
--- Timing: Normal mode Fast mode
------------------------------------------------------------------
--- Fscl 100KHz 400KHz
--- Th_scl 4.0us 0.6us High period of SCL
--- Tl_scl 4.7us 1.3us Low period of SCL
--- Tsu:sta 4.7us 0.6us setup time for a repeated start condition
--- Tsu:sto 4.0us 0.6us setup time for a stop conditon
--- Tbuf 4.7us 1.3us Bus free time between a stop and start condition
---
-
-library ieee;
-use ieee.std_logic_1164.all;
-use ieee.std_logic_arith.all;
-
-entity i2c_master_bit_ctrl is
- port (
- clk : in std_logic;
- rst : in std_logic;
- nReset : in std_logic;
- ena : in std_logic; -- core enable signal
-
- clk_cnt : in unsigned(15 downto 0); -- clock prescale value
-
- cmd : in std_logic_vector(3 downto 0);
- cmd_ack : out std_logic; -- command completed
- busy : out std_logic; -- i2c bus busy
- al : out std_logic; -- arbitration lost
-
- din : in std_logic;
- dout : out std_logic;
-
- -- i2c lines
- scl_i : in std_logic; -- i2c clock line input
- scl_o : out std_logic; -- i2c clock line output
- scl_oen : out std_logic; -- i2c clock line output enable, active low
- sda_i : in std_logic; -- i2c data line input
- sda_o : out std_logic; -- i2c data line output
- sda_oen : out std_logic -- i2c data line output enable, active low
- );
-end entity i2c_master_bit_ctrl;
-
-architecture structural of i2c_master_bit_ctrl is
- constant I2C_CMD_NOP : std_logic_vector(3 downto 0) := "0000";
- constant I2C_CMD_START : std_logic_vector(3 downto 0) := "0001";
- constant I2C_CMD_STOP : std_logic_vector(3 downto 0) := "0010";
- constant I2C_CMD_READ : std_logic_vector(3 downto 0) := "0100";
- constant I2C_CMD_WRITE : std_logic_vector(3 downto 0) := "1000";
-
- type states is (idle, start_a, start_b, start_c, start_d, start_e,
- stop_a, stop_b, stop_c, stop_d, rd_a, rd_b, rd_c, rd_d, wr_a, wr_b, wr_c, wr_d);
- signal c_state : states;
-
- signal iscl_oen, isda_oen : std_logic; -- internal I2C lines
- signal sda_chk : std_logic; -- check SDA status (multi-master arbitration)
- signal dscl_oen : std_logic; -- delayed scl_oen signals
- signal sSCL, sSDA : std_logic; -- synchronized SCL and SDA inputs
- signal clk_en, slave_wait : std_logic; -- clock generation signals
- signal ial : std_logic; -- internal arbitration lost signal
--- signal cnt : unsigned(15 downto 0) := clk_cnt; -- clock divider counter (simulation)
- signal cnt : unsigned(15 downto 0); -- clock divider counter (synthesis)
-
-begin
- -- whenever the slave is not ready it can delay the cycle by pulling SCL low
- -- delay scl_oen
- process (clk)
- begin
- if (clk'event and clk = '1') then
- dscl_oen <= iscl_oen;
- end if;
- end process;
- slave_wait <= dscl_oen and not sSCL;
-
- -- generate clk enable signal
- gen_clken: process(clk, nReset)
- begin
- if (nReset = '0') then
- cnt <= (others => '0');
- clk_en <= '1';
- elsif (clk'event and clk = '1') then
- if (rst = '1') then
- cnt <= (others => '0');
- clk_en <= '1';
- elsif ( (cnt = 0) or (ena = '0') ) then
- cnt <= clk_cnt;
- clk_en <= '1';
- elsif (slave_wait = '1') then
- cnt <= cnt;
- clk_en <= '0';
- else
- cnt <= cnt -1;
- clk_en <= '0';
- end if;
- end if;
- end process gen_clken;
-
-
- -- generate bus status controller
- bus_status_ctrl: block
- signal dSCL, dSDA : std_logic; -- delayes sSCL and sSDA
- signal sta_condition : std_logic; -- start detected
- signal sto_condition : std_logic; -- stop detected
- signal cmd_stop : std_logic; -- STOP command
- signal ibusy : std_logic; -- internal busy signal
- begin
- -- synchronize SCL and SDA inputs
- synch_scl_sda: process(clk, nReset)
- begin
- if (nReset = '0') then
- sSCL <= '1';
- sSDA <= '1';
-
- dSCL <= '1';
- dSDA <= '1';
- elsif (clk'event and clk = '1') then
- if (rst = '1') then
- sSCL <= '1';
- sSDA <= '1';
-
- dSCL <= '1';
- dSDA <= '1';
- else
- sSCL <= scl_i;
- sSDA <= sda_i;
-
- dSCL <= sSCL;
- dSDA <= sSDA;
- end if;
- end if;
- end process synch_SCL_SDA;
-
- -- detect start condition => detect falling edge on SDA while SCL is high
- -- detect stop condition => detect rising edge on SDA while SCL is high
- detect_sta_sto: process(clk, nReset)
- begin
- if (nReset = '0') then
- sta_condition <= '0';
- sto_condition <= '0';
- elsif (clk'event and clk = '1') then
- if (rst = '1') then
- sta_condition <= '0';
- sto_condition <= '0';
- else
- sta_condition <= (not sSDA and dSDA) and sSCL;
- sto_condition <= (sSDA and not dSDA) and sSCL;
- end if;
- end if;
- end process detect_sta_sto;
-
- -- generate i2c-bus busy signal
- gen_busy: process(clk, nReset)
- begin
- if (nReset = '0') then
- ibusy <= '0';
- elsif (clk'event and clk = '1') then
- if (rst = '1') then
- ibusy <= '0';
- else
- ibusy <= (sta_condition or ibusy) and not sto_condition;
- end if;
- end if;
- end process gen_busy;
- busy <= ibusy;
-
-
- -- generate arbitration lost signal
- -- aribitration lost when:
- -- 1) master drives SDA high, but the i2c bus is low
- -- 2) stop detected while not requested (detect during 'idle' state)
- gen_al: process(clk, nReset)
- begin
- if (nReset = '0') then
- cmd_stop <= '0';
- ial <= '0';
- elsif (clk'event and clk = '1') then
- if (rst = '1') then
- cmd_stop <= '0';
- ial <= '0';
- else
- if (clk_en = '1') then
- if (cmd = I2C_CMD_STOP) then
- cmd_stop <= '1';
- else
- cmd_stop <= '0';
- end if;
- end if;
-
- if (c_state = idle) then
- ial <= (sda_chk and not sSDA and isda_oen);
- else
- ial <= (sda_chk and not sSDA and isda_oen) or (sto_condition and not cmd_stop);
- end if;
-
- end if;
- end if;
- end process gen_al;
- al <= ial;
-
- -- generate dout signal, store dout on rising edge of SCL
- gen_dout: process(clk)
- begin
- if (clk'event and clk = '1') then
- if (sSCL = '1' and dSCL = '0') then
- dout <= sSDA;
- end if;
- end if;
- end process gen_dout;
- end block bus_status_ctrl;
-
-
- -- generate statemachine
- nxt_state_decoder : process (clk, nReset, c_state, cmd)
- begin
- if (nReset = '0') then
- c_state <= idle;
- cmd_ack <= '0';
- iscl_oen <= '1';
- isda_oen <= '1';
- sda_chk <= '0';
- elsif (clk'event and clk = '1') then
- if (rst = '1' or ial = '1') then
- c_state <= idle;
- cmd_ack <= '0';
- iscl_oen <= '1';
- isda_oen <= '1';
- sda_chk <= '0';
- else
- cmd_ack <= '0'; -- default no acknowledge
-
- if (clk_en = '1') then
- case (c_state) is
- -- idle
- when idle =>
- case cmd is
- when I2C_CMD_START => c_state <= start_a;
- when I2C_CMD_STOP => c_state <= stop_a;
- when I2C_CMD_WRITE => c_state <= wr_a;
- when I2C_CMD_READ => c_state <= rd_a;
- when others => c_state <= idle; -- NOP command
- end case;
-
- iscl_oen <= iscl_oen; -- keep SCL in same state
- isda_oen <= isda_oen; -- keep SDA in same state
- sda_chk <= '0'; -- don't check SDA
-
- -- start
- when start_a =>
- c_state <= start_b;
- iscl_oen <= iscl_oen; -- keep SCL in same state (for repeated start)
- isda_oen <= '1'; -- set SDA high
- sda_chk <= '0'; -- don't check SDA
-
- when start_b =>
- c_state <= start_c;
- iscl_oen <= '1'; -- set SCL high
- isda_oen <= '1'; -- keep SDA high
- sda_chk <= '0'; -- don't check SDA
-
- when start_c =>
- c_state <= start_d;
- iscl_oen <= '1'; -- keep SCL high
- isda_oen <= '0'; -- set SDA low
- sda_chk <= '0'; -- don't check SDA
-
- when start_d =>
- c_state <= start_e;
- iscl_oen <= '1'; -- keep SCL high
- isda_oen <= '0'; -- keep SDA low
- sda_chk <= '0'; -- don't check SDA
-
- when start_e =>
- c_state <= idle;
- cmd_ack <= '1'; -- command completed
- iscl_oen <= '0'; -- set SCL low
- isda_oen <= '0'; -- keep SDA low
- sda_chk <= '0'; -- don't check SDA
-
- -- stop
- when stop_a =>
- c_state <= stop_b;
- iscl_oen <= '0'; -- keep SCL low
- isda_oen <= '0'; -- set SDA low
- sda_chk <= '0'; -- don't check SDA
-
- when stop_b =>
- c_state <= stop_c;
- iscl_oen <= '1'; -- set SCL high
- isda_oen <= '0'; -- keep SDA low
- sda_chk <= '0'; -- don't check SDA
-
- when stop_c =>
- c_state <= stop_d;
- iscl_oen <= '1'; -- keep SCL high
- isda_oen <= '0'; -- keep SDA low
- sda_chk <= '0'; -- don't check SDA
-
- when stop_d =>
- c_state <= idle;
- cmd_ack <= '1'; -- command completed
- iscl_oen <= '1'; -- keep SCL high
- isda_oen <= '1'; -- set SDA high
- sda_chk <= '0'; -- don't check SDA
-
- -- read
- when rd_a =>
- c_state <= rd_b;
- iscl_oen <= '0'; -- keep SCL low
- isda_oen <= '1'; -- tri-state SDA
- sda_chk <= '0'; -- don't check SDA
-
- when rd_b =>
- c_state <= rd_c;
- iscl_oen <= '1'; -- set SCL high
- isda_oen <= '1'; -- tri-state SDA
- sda_chk <= '0'; -- don't check SDA
-
- when rd_c =>
- c_state <= rd_d;
- iscl_oen <= '1'; -- keep SCL high
- isda_oen <= '1'; -- tri-state SDA
- sda_chk <= '0'; -- don't check SDA
-
- when rd_d =>
- c_state <= idle;
- cmd_ack <= '1'; -- command completed
- iscl_oen <= '0'; -- set SCL low
- isda_oen <= '1'; -- tri-state SDA
- sda_chk <= '0'; -- don't check SDA
-
- -- write
- when wr_a =>
- c_state <= wr_b;
- iscl_oen <= '0'; -- keep SCL low
- isda_oen <= din; -- set SDA
- sda_chk <= '0'; -- don't check SDA (SCL low)
-
- when wr_b =>
- c_state <= wr_c;
- iscl_oen <= '1'; -- set SCL high
- isda_oen <= din; -- keep SDA
- sda_chk <= '1'; -- check SDA
-
- when wr_c =>
- c_state <= wr_d;
- iscl_oen <= '1'; -- keep SCL high
- isda_oen <= din; -- keep SDA
- sda_chk <= '1'; -- check SDA
-
- when wr_d =>
- c_state <= idle;
- cmd_ack <= '1'; -- command completed
- iscl_oen <= '0'; -- set SCL low
- isda_oen <= din; -- keep SDA
- sda_chk <= '0'; -- don't check SDA (SCL low)
-
- when others =>
-
- end case;
- end if;
- end if;
- end if;
- end process nxt_state_decoder;
-
-
- -- assign outputs
- scl_o <= '0';
- scl_oen <= iscl_oen;
- sda_o <= '0';
- sda_oen <= isda_oen;
-end architecture structural;
-
diff --git a/fpga/usrp2/opencores/i2c/rtl/vhdl/i2c_master_byte_ctrl.vhd b/fpga/usrp2/opencores/i2c/rtl/vhdl/i2c_master_byte_ctrl.vhd
deleted file mode 100644
index bdb2a881e..000000000
--- a/fpga/usrp2/opencores/i2c/rtl/vhdl/i2c_master_byte_ctrl.vhd
+++ /dev/null
@@ -1,370 +0,0 @@
----------------------------------------------------------------------
----- ----
----- WISHBONE revB2 compl. I2C Master Core; byte-controller ----
----- ----
----- ----
----- Author: Richard Herveille ----
----- richard@asics.ws ----
----- www.asics.ws ----
----- ----
----- Downloaded from: http://www.opencores.org/projects/i2c/ ----
----- ----
----------------------------------------------------------------------
----- ----
----- Copyright (C) 2000 Richard Herveille ----
----- richard@asics.ws ----
----- ----
----- This source file may be used and distributed without ----
----- restriction provided that this copyright statement is not ----
----- removed from the file and that any derivative work contains ----
----- the original copyright notice and the associated disclaimer.----
----- ----
----- THIS SOFTWARE IS PROVIDED ``AS IS'' AND WITHOUT ANY ----
----- EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED ----
----- TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS ----
----- FOR A PARTICULAR PURPOSE. IN NO EVENT SHALL THE AUTHOR ----
----- OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, ----
----- INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES ----
----- (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE ----
----- GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR ----
----- BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF ----
----- LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT ----
----- (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT ----
----- OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE ----
----- POSSIBILITY OF SUCH DAMAGE. ----
----- ----
----------------------------------------------------------------------
-
--- CVS Log
---
--- $Id: i2c_master_byte_ctrl.vhd,v 1.5 2004/02/18 11:41:48 rherveille Exp $
---
--- $Date: 2004/02/18 11:41:48 $
--- $Revision: 1.5 $
--- $Author: rherveille $
--- $Locker: $
--- $State: Exp $
---
--- Change History:
--- $Log: i2c_master_byte_ctrl.vhd,v $
--- Revision 1.5 2004/02/18 11:41:48 rherveille
--- Fixed a potential bug in the statemachine. During a 'stop' 2 cmd_ack signals were generated. Possibly canceling a new start command.
---
--- Revision 1.4 2003/08/09 07:01:13 rherveille
--- Fixed a bug in the Arbitration Lost generation caused by delay on the (external) sda line.
--- Fixed a potential bug in the byte controller's host-acknowledge generation.
---
--- Revision 1.3 2002/12/26 16:05:47 rherveille
--- Core is now a Multimaster I2C controller.
---
--- Revision 1.2 2002/11/30 22:24:37 rherveille
--- Cleaned up code
---
--- Revision 1.1 2001/11/05 12:02:33 rherveille
--- Split i2c_master_core.vhd into separate files for each entity; same layout as verilog version.
--- Code updated, is now up-to-date to doc. rev.0.4.
--- Added headers.
---
-
-
-
-
---
-------------------------------------------
--- Byte controller section
-------------------------------------------
---
-library ieee;
-use ieee.std_logic_1164.all;
-use ieee.std_logic_arith.all;
-
-entity i2c_master_byte_ctrl is
- port (
- clk : in std_logic;
- rst : in std_logic; -- synchronous active high reset (WISHBONE compatible)
- nReset : in std_logic; -- asynchornous active low reset (FPGA compatible)
- ena : in std_logic; -- core enable signal
-
- clk_cnt : in unsigned(15 downto 0); -- 4x SCL
-
- -- input signals
- start,
- stop,
- read,
- write,
- ack_in : std_logic;
- din : in std_logic_vector(7 downto 0);
-
- -- output signals
- cmd_ack : out std_logic; -- command done
- ack_out : out std_logic;
- i2c_busy : out std_logic; -- arbitration lost
- i2c_al : out std_logic; -- i2c bus busy
- dout : out std_logic_vector(7 downto 0);
-
- -- i2c lines
- scl_i : in std_logic; -- i2c clock line input
- scl_o : out std_logic; -- i2c clock line output
- scl_oen : out std_logic; -- i2c clock line output enable, active low
- sda_i : in std_logic; -- i2c data line input
- sda_o : out std_logic; -- i2c data line output
- sda_oen : out std_logic -- i2c data line output enable, active low
- );
-end entity i2c_master_byte_ctrl;
-
-architecture structural of i2c_master_byte_ctrl is
- component i2c_master_bit_ctrl is
- port (
- clk : in std_logic;
- rst : in std_logic;
- nReset : in std_logic;
- ena : in std_logic; -- core enable signal
-
- clk_cnt : in unsigned(15 downto 0); -- clock prescale value
-
- cmd : in std_logic_vector(3 downto 0);
- cmd_ack : out std_logic; -- command done
- busy : out std_logic; -- i2c bus busy
- al : out std_logic; -- arbitration lost
-
- din : in std_logic;
- dout : out std_logic;
-
- -- i2c lines
- scl_i : in std_logic; -- i2c clock line input
- scl_o : out std_logic; -- i2c clock line output
- scl_oen : out std_logic; -- i2c clock line output enable, active low
- sda_i : in std_logic; -- i2c data line input
- sda_o : out std_logic; -- i2c data line output
- sda_oen : out std_logic -- i2c data line output enable, active low
- );
- end component i2c_master_bit_ctrl;
-
- -- commands for bit_controller block
- constant I2C_CMD_NOP : std_logic_vector(3 downto 0) := "0000";
- constant I2C_CMD_START : std_logic_vector(3 downto 0) := "0001";
- constant I2C_CMD_STOP : std_logic_vector(3 downto 0) := "0010";
- constant I2C_CMD_READ : std_logic_vector(3 downto 0) := "0100";
- constant I2C_CMD_WRITE : std_logic_vector(3 downto 0) := "1000";
-
- -- signals for bit_controller
- signal core_cmd : std_logic_vector(3 downto 0);
- signal core_ack, core_txd, core_rxd : std_logic;
- signal al : std_logic;
-
- -- signals for shift register
- signal sr : std_logic_vector(7 downto 0); -- 8bit shift register
- signal shift, ld : std_logic;
-
- -- signals for state machine
- signal go, host_ack : std_logic;
- signal dcnt : unsigned(2 downto 0); -- data counter
- signal cnt_done : std_logic;
-
-begin
- -- hookup bit_controller
- bit_ctrl: i2c_master_bit_ctrl port map(
- clk => clk,
- rst => rst,
- nReset => nReset,
- ena => ena,
- clk_cnt => clk_cnt,
- cmd => core_cmd,
- cmd_ack => core_ack,
- busy => i2c_busy,
- al => al,
- din => core_txd,
- dout => core_rxd,
- scl_i => scl_i,
- scl_o => scl_o,
- scl_oen => scl_oen,
- sda_i => sda_i,
- sda_o => sda_o,
- sda_oen => sda_oen
- );
- i2c_al <= al;
-
- -- generate host-command-acknowledge
- cmd_ack <= host_ack;
-
- -- generate go-signal
- go <= (read or write or stop) and not host_ack;
-
- -- assign Dout output to shift-register
- dout <= sr;
-
- -- generate shift register
- shift_register: process(clk, nReset)
- begin
- if (nReset = '0') then
- sr <= (others => '0');
- elsif (clk'event and clk = '1') then
- if (rst = '1') then
- sr <= (others => '0');
- elsif (ld = '1') then
- sr <= din;
- elsif (shift = '1') then
- sr <= (sr(6 downto 0) & core_rxd);
- end if;
- end if;
- end process shift_register;
-
- -- generate data-counter
- data_cnt: process(clk, nReset)
- begin
- if (nReset = '0') then
- dcnt <= (others => '0');
- elsif (clk'event and clk = '1') then
- if (rst = '1') then
- dcnt <= (others => '0');
- elsif (ld = '1') then
- dcnt <= (others => '1'); -- load counter with 7
- elsif (shift = '1') then
- dcnt <= dcnt -1;
- end if;
- end if;
- end process data_cnt;
-
- cnt_done <= '1' when (dcnt = 0) else '0';
-
- --
- -- state machine
- --
- statemachine : block
- type states is (st_idle, st_start, st_read, st_write, st_ack, st_stop);
- signal c_state : states;
- begin
- --
- -- command interpreter, translate complex commands into simpler I2C commands
- --
- nxt_state_decoder: process(clk, nReset)
- begin
- if (nReset = '0') then
- core_cmd <= I2C_CMD_NOP;
- core_txd <= '0';
- shift <= '0';
- ld <= '0';
- host_ack <= '0';
- c_state <= st_idle;
- ack_out <= '0';
- elsif (clk'event and clk = '1') then
- if (rst = '1' or al = '1') then
- core_cmd <= I2C_CMD_NOP;
- core_txd <= '0';
- shift <= '0';
- ld <= '0';
- host_ack <= '0';
- c_state <= st_idle;
- ack_out <= '0';
- else
- -- initialy reset all signal
- core_txd <= sr(7);
- shift <= '0';
- ld <= '0';
- host_ack <= '0';
-
- case c_state is
- when st_idle =>
- if (go = '1') then
- if (start = '1') then
- c_state <= st_start;
- core_cmd <= I2C_CMD_START;
- elsif (read = '1') then
- c_state <= st_read;
- core_cmd <= I2C_CMD_READ;
- elsif (write = '1') then
- c_state <= st_write;
- core_cmd <= I2C_CMD_WRITE;
- else -- stop
- c_state <= st_stop;
- core_cmd <= I2C_CMD_STOP;
- end if;
-
- ld <= '1';
- end if;
-
- when st_start =>
- if (core_ack = '1') then
- if (read = '1') then
- c_state <= st_read;
- core_cmd <= I2C_CMD_READ;
- else
- c_state <= st_write;
- core_cmd <= I2C_CMD_WRITE;
- end if;
-
- ld <= '1';
- end if;
-
- when st_write =>
- if (core_ack = '1') then
- if (cnt_done = '1') then
- c_state <= st_ack;
- core_cmd <= I2C_CMD_READ;
- else
- c_state <= st_write; -- stay in same state
- core_cmd <= I2C_CMD_WRITE; -- write next bit
- shift <= '1';
- end if;
- end if;
-
- when st_read =>
- if (core_ack = '1') then
- if (cnt_done = '1') then
- c_state <= st_ack;
- core_cmd <= I2C_CMD_WRITE;
- else
- c_state <= st_read; -- stay in same state
- core_cmd <= I2C_CMD_READ; -- read next bit
- end if;
-
- shift <= '1';
- core_txd <= ack_in;
- end if;
-
- when st_ack =>
- if (core_ack = '1') then
- -- check for stop; Should a STOP command be generated ?
- if (stop = '1') then
- c_state <= st_stop;
- core_cmd <= I2C_CMD_STOP;
- else
- c_state <= st_idle;
- core_cmd <= I2C_CMD_NOP;
-
- -- generate command acknowledge signal
- host_ack <= '1';
- end if;
-
- -- assign ack_out output to core_rxd (contains last received bit)
- ack_out <= core_rxd;
-
- core_txd <= '1';
- else
- core_txd <= ack_in;
- end if;
-
- when st_stop =>
- if (core_ack = '1') then
- c_state <= st_idle;
- core_cmd <= I2C_CMD_NOP;
-
- -- generate command acknowledge signal
- host_ack <= '1';
- end if;
-
- when others => -- illegal states
- c_state <= st_idle;
- core_cmd <= I2C_CMD_NOP;
- report ("Byte controller entered illegal state.");
-
- end case;
-
- end if;
- end if;
- end process nxt_state_decoder;
-
- end block statemachine;
-
-end architecture structural;
-
diff --git a/fpga/usrp2/opencores/i2c/rtl/vhdl/i2c_master_top.vhd b/fpga/usrp2/opencores/i2c/rtl/vhdl/i2c_master_top.vhd
deleted file mode 100644
index a2557120f..000000000
--- a/fpga/usrp2/opencores/i2c/rtl/vhdl/i2c_master_top.vhd
+++ /dev/null
@@ -1,359 +0,0 @@
----------------------------------------------------------------------
----- ----
----- WISHBONE revB2 compl. I2C Master Core; top level ----
----- ----
----- ----
----- Author: Richard Herveille ----
----- richard@asics.ws ----
----- www.asics.ws ----
----- ----
----- Downloaded from: http://www.opencores.org/projects/i2c/ ----
----- ----
----------------------------------------------------------------------
----- ----
----- Copyright (C) 2000 Richard Herveille ----
----- richard@asics.ws ----
----- ----
----- This source file may be used and distributed without ----
----- restriction provided that this copyright statement is not ----
----- removed from the file and that any derivative work contains ----
----- the original copyright notice and the associated disclaimer.----
----- ----
----- THIS SOFTWARE IS PROVIDED ``AS IS'' AND WITHOUT ANY ----
----- EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED ----
----- TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS ----
----- FOR A PARTICULAR PURPOSE. IN NO EVENT SHALL THE AUTHOR ----
----- OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, ----
----- INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES ----
----- (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE ----
----- GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR ----
----- BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF ----
----- LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT ----
----- (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT ----
----- OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE ----
----- POSSIBILITY OF SUCH DAMAGE. ----
----- ----
----------------------------------------------------------------------
-
--- CVS Log
---
--- $Id: i2c_master_top.vhd,v 1.7 2004/03/14 10:17:03 rherveille Exp $
---
--- $Date: 2004/03/14 10:17:03 $
--- $Revision: 1.7 $
--- $Author: rherveille $
--- $Locker: $
--- $State: Exp $
---
--- Change History:
--- $Log: i2c_master_top.vhd,v $
--- Revision 1.7 2004/03/14 10:17:03 rherveille
--- Fixed simulation issue when writing to CR register
---
--- Revision 1.6 2003/08/09 07:01:13 rherveille
--- Fixed a bug in the Arbitration Lost generation caused by delay on the (external) sda line.
--- Fixed a potential bug in the byte controller's host-acknowledge generation.
---
--- Revision 1.5 2003/02/01 02:03:06 rherveille
--- Fixed a few 'arbitration lost' bugs. VHDL version only.
---
--- Revision 1.4 2002/12/26 16:05:47 rherveille
--- Core is now a Multimaster I2C controller.
---
--- Revision 1.3 2002/11/30 22:24:37 rherveille
--- Cleaned up code
---
--- Revision 1.2 2001/11/10 10:52:44 rherveille
--- Changed PRER reset value from 0x0000 to 0xffff, conform specs.
---
-
-
-library ieee;
-use ieee.std_logic_1164.all;
-use ieee.std_logic_arith.all;
-
-entity i2c_master_top is
- generic(
- ARST_LVL : std_logic := '0' -- asynchronous reset level
- );
- port (
- -- wishbone signals
- wb_clk_i : in std_logic; -- master clock input
- wb_rst_i : in std_logic := '0'; -- synchronous active high reset
- arst_i : in std_logic := not ARST_LVL; -- asynchronous reset
- wb_adr_i : in unsigned(2 downto 0); -- lower address bits
- wb_dat_i : in std_logic_vector(7 downto 0); -- Databus input
- wb_dat_o : out std_logic_vector(7 downto 0); -- Databus output
- wb_we_i : in std_logic; -- Write enable input
- wb_stb_i : in std_logic; -- Strobe signals / core select signal
- wb_cyc_i : in std_logic; -- Valid bus cycle input
- wb_ack_o : out std_logic; -- Bus cycle acknowledge output
- wb_inta_o : out std_logic; -- interrupt request output signal
-
- -- i2c lines
- scl_pad_i : in std_logic; -- i2c clock line input
- scl_pad_o : out std_logic; -- i2c clock line output
- scl_padoen_o : out std_logic; -- i2c clock line output enable, active low
- sda_pad_i : in std_logic; -- i2c data line input
- sda_pad_o : out std_logic; -- i2c data line output
- sda_padoen_o : out std_logic -- i2c data line output enable, active low
- );
-end entity i2c_master_top;
-
-architecture structural of i2c_master_top is
- component i2c_master_byte_ctrl is
- port (
- clk : in std_logic;
- rst : in std_logic; -- synchronous active high reset (WISHBONE compatible)
- nReset : in std_logic; -- asynchornous active low reset (FPGA compatible)
- ena : in std_logic; -- core enable signal
-
- clk_cnt : in unsigned(15 downto 0); -- 4x SCL
-
- -- input signals
- start,
- stop,
- read,
- write,
- ack_in : std_logic;
- din : in std_logic_vector(7 downto 0);
-
- -- output signals
- cmd_ack : out std_logic;
- ack_out : out std_logic;
- i2c_busy : out std_logic;
- i2c_al : out std_logic;
- dout : out std_logic_vector(7 downto 0);
-
- -- i2c lines
- scl_i : in std_logic; -- i2c clock line input
- scl_o : out std_logic; -- i2c clock line output
- scl_oen : out std_logic; -- i2c clock line output enable, active low
- sda_i : in std_logic; -- i2c data line input
- sda_o : out std_logic; -- i2c data line output
- sda_oen : out std_logic -- i2c data line output enable, active low
- );
- end component i2c_master_byte_ctrl;
-
- -- registers
- signal prer : unsigned(15 downto 0); -- clock prescale register
- signal ctr : std_logic_vector(7 downto 0); -- control register
- signal txr : std_logic_vector(7 downto 0); -- transmit register
- signal rxr : std_logic_vector(7 downto 0); -- receive register
- signal cr : std_logic_vector(7 downto 0); -- command register
- signal sr : std_logic_vector(7 downto 0); -- status register
-
- -- internal reset signal
- signal rst_i : std_logic;
-
- -- wishbone write access
- signal wb_wacc : std_logic;
-
- -- internal acknowledge signal
- signal iack_o : std_logic;
-
- -- done signal: command completed, clear command register
- signal done : std_logic;
-
- -- command register signals
- signal sta, sto, rd, wr, ack, iack : std_logic;
-
- signal core_en : std_logic; -- core enable signal
- signal ien : std_logic; -- interrupt enable signal
-
- -- status register signals
- signal irxack, rxack : std_logic; -- received aknowledge from slave
- signal tip : std_logic; -- transfer in progress
- signal irq_flag : std_logic; -- interrupt pending flag
- signal i2c_busy : std_logic; -- i2c bus busy (start signal detected)
- signal i2c_al, al : std_logic; -- arbitration lost
-
-begin
- -- generate internal reset signal
- rst_i <= arst_i xor ARST_LVL;
-
- -- generate acknowledge output signal
- gen_ack_o : process(wb_clk_i)
- begin
- if (wb_clk_i'event and wb_clk_i = '1') then
- iack_o <= wb_cyc_i and wb_stb_i and not iack_o; -- because timing is always honored
- end if;
- end process gen_ack_o;
- wb_ack_o <= iack_o;
-
-
- -- generate wishbone write access signal
- wb_wacc <= wb_cyc_i and wb_stb_i and wb_we_i;
-
- -- assign wb_dat_o
- assign_dato : process(wb_clk_i)
- begin
- if (wb_clk_i'event and wb_clk_i = '1') then
- case wb_adr_i is
- when "000" => wb_dat_o <= std_logic_vector(prer( 7 downto 0));
- when "001" => wb_dat_o <= std_logic_vector(prer(15 downto 8));
- when "010" => wb_dat_o <= ctr;
- when "011" => wb_dat_o <= rxr; -- write is transmit register TxR
- when "100" => wb_dat_o <= sr; -- write is command register CR
-
- -- Debugging registers:
- -- These registers are not documented.
- -- Functionality could change in future releases
- when "101" => wb_dat_o <= txr;
- when "110" => wb_dat_o <= cr;
- when "111" => wb_dat_o <= (others => '0');
- when others => wb_dat_o <= (others => 'X'); -- for simulation only
- end case;
- end if;
- end process assign_dato;
-
-
- -- generate registers (CR, SR see below)
- gen_regs: process(rst_i, wb_clk_i)
- begin
- if (rst_i = '0') then
- prer <= (others => '1');
- ctr <= (others => '0');
- txr <= (others => '0');
- elsif (wb_clk_i'event and wb_clk_i = '1') then
- if (wb_rst_i = '1') then
- prer <= (others => '1');
- ctr <= (others => '0');
- txr <= (others => '0');
- elsif (wb_wacc = '1') then
- case wb_adr_i is
- when "000" => prer( 7 downto 0) <= unsigned(wb_dat_i);
- when "001" => prer(15 downto 8) <= unsigned(wb_dat_i);
- when "010" => ctr <= wb_dat_i;
- when "011" => txr <= wb_dat_i;
- when "100" => null; --write to CR, avoid executing the others clause
-
- -- illegal cases, for simulation only
- when others =>
- report ("Illegal write address, setting all registers to unknown.");
- prer <= (others => 'X');
- ctr <= (others => 'X');
- txr <= (others => 'X');
- end case;
- end if;
- end if;
- end process gen_regs;
-
-
- -- generate command register
- gen_cr: process(rst_i, wb_clk_i)
- begin
- if (rst_i = '0') then
- cr <= (others => '0');
- elsif (wb_clk_i'event and wb_clk_i = '1') then
- if (wb_rst_i = '1') then
- cr <= (others => '0');
- elsif (wb_wacc = '1') then
- if ( (core_en = '1') and (wb_adr_i = 4) ) then
- -- only take new commands when i2c core enabled
- -- pending commands are finished
- cr <= wb_dat_i;
- end if;
- else
- if (done = '1' or i2c_al = '1') then
- cr(7 downto 4) <= (others => '0'); -- clear command bits when command done or arbitration lost
- end if;
-
- cr(2 downto 1) <= (others => '0'); -- reserved bits, always '0'
- cr(0) <= '0'; -- clear IRQ_ACK bit
- end if;
- end if;
- end process gen_cr;
-
- -- decode command register
- sta <= cr(7);
- sto <= cr(6);
- rd <= cr(5);
- wr <= cr(4);
- ack <= cr(3);
- iack <= cr(0);
-
- -- decode control register
- core_en <= ctr(7);
- ien <= ctr(6);
-
- -- hookup byte controller block
- byte_ctrl: i2c_master_byte_ctrl port map (
- clk => wb_clk_i,
- rst => wb_rst_i,
- nReset => rst_i,
- ena => core_en,
- clk_cnt => prer,
- start => sta,
- stop => sto,
- read => rd,
- write => wr,
- ack_in => ack,
- i2c_busy => i2c_busy,
- i2c_al => i2c_al,
- din => txr,
- cmd_ack => done,
- ack_out => irxack,
- dout => rxr,
- scl_i => scl_pad_i,
- scl_o => scl_pad_o,
- scl_oen => scl_padoen_o,
- sda_i => sda_pad_i,
- sda_o => sda_pad_o,
- sda_oen => sda_padoen_o
- );
-
-
- -- status register block + interrupt request signal
- st_irq_block : block
- begin
- -- generate status register bits
- gen_sr_bits: process (wb_clk_i, rst_i)
- begin
- if (rst_i = '0') then
- al <= '0';
- rxack <= '0';
- tip <= '0';
- irq_flag <= '0';
- elsif (wb_clk_i'event and wb_clk_i = '1') then
- if (wb_rst_i = '1') then
- al <= '0';
- rxack <= '0';
- tip <= '0';
- irq_flag <= '0';
- else
- al <= i2c_al or (al and not sta);
- rxack <= irxack;
- tip <= (rd or wr);
-
- -- interrupt request flag is always generated
- irq_flag <= (done or i2c_al or irq_flag) and not iack;
- end if;
- end if;
- end process gen_sr_bits;
-
- -- generate interrupt request signals
- gen_irq: process (wb_clk_i, rst_i)
- begin
- if (rst_i = '0') then
- wb_inta_o <= '0';
- elsif (wb_clk_i'event and wb_clk_i = '1') then
- if (wb_rst_i = '1') then
- wb_inta_o <= '0';
- else
- -- interrupt signal is only generated when IEN (interrupt enable bit) is set
- wb_inta_o <= irq_flag and ien;
- end if;
- end if;
- end process gen_irq;
-
- -- assign status register bits
- sr(7) <= rxack;
- sr(6) <= i2c_busy;
- sr(5) <= al;
- sr(4 downto 2) <= (others => '0'); -- reserved
- sr(1) <= tip;
- sr(0) <= irq_flag;
- end block;
-
-end architecture structural;
diff --git a/fpga/usrp2/opencores/i2c/rtl/vhdl/readme b/fpga/usrp2/opencores/i2c/rtl/vhdl/readme
deleted file mode 100644
index 0d049f736..000000000
--- a/fpga/usrp2/opencores/i2c/rtl/vhdl/readme
+++ /dev/null
@@ -1,25 +0,0 @@
-
-
--- This code is provided for free and may be used and --
--- distributed without restriction provided that the --
--- copyright statement is not removed from the file and --
--- that any derivative work contains the original --
--- copyright notice and the associated disclaimer. --
-
--- Comments and suggestions are always welcome --
-
-The i2c_master core consists of three files:
-
-- i2c_master_top -- top level
-- i2c_master_byte_ctrl -- byte controller
-- i2c_master_bit_ctrl -- bit controller
-
-VHDL needs to be compiled in order. The files are listed
-above in descending order.
-
-I2C.VHD and tst_ds1621.vhd are not supported anymore.
-They remain mostly for historical purposes, altough they
-might prove usefull.
-
-Richard Herveille
-rherveille@opencores.org
diff --git a/fpga/usrp2/opencores/i2c/rtl/vhdl/tst_ds1621.vhd b/fpga/usrp2/opencores/i2c/rtl/vhdl/tst_ds1621.vhd
deleted file mode 100644
index ccf50460c..000000000
--- a/fpga/usrp2/opencores/i2c/rtl/vhdl/tst_ds1621.vhd
+++ /dev/null
@@ -1,283 +0,0 @@
---
---
--- State machine for reading data from Dallas 1621
---
--- Testsystem for i2c controller
---
---
-library ieee;
-use ieee.std_logic_1164.all;
-use ieee.std_logic_arith.all;
-
-use work.i2c.all;
-
-entity DS1621_interface is
- port (
- clk : in std_logic;
- nReset : in std_logic;
-
- Dout : out std_logic_vector(7 downto 0); -- data read from ds1621
-
- error : out std_logic; -- no correct ack received
-
- SCL : inout std_logic;
- SDA : inout std_logic
- );
-end entity DS1621_interface;
-
-architecture structural of DS1621_interface is
- constant SLAVE_ADDR : std_logic_vector(6 downto 0) := "1001000";
- constant CLK_CNT : unsigned(7 downto 0) := conv_unsigned(20, 8);
-
- signal cmd_ack : std_logic;
- signal D : std_logic_vector(7 downto 0);
- signal lack, store_dout : std_logic;
-
- signal start, read, write, ack, stop : std_logic;
- signal i2c_dout : std_logic_vector(7 downto 0);
-
-begin
- -- hookup I2C controller
- u1: simple_i2c port map (clk => clk, ena => '1', clk_cnt => clk_cnt, nReset => nReset,
- read => read, write => write, start => start, stop => stop, ack_in => ack, cmd_ack => cmd_ack,
- Din => D, Dout => i2c_dout, ack_out => lack, SCL => SCL, SDA => SDA);
-
- init_statemachine : block
- type states is (i1, i2, i3, i4, i5, t1, t2, t3, t4, t5);
- signal state : states;
- begin
- nxt_state_decoder: process(clk, nReset, state)
- variable nxt_state : states;
- variable iD : std_logic_vector(7 downto 0);
- variable ierr : std_logic;
- variable istart, iread, iwrite, iack, istop : std_logic;
- variable istore_dout : std_logic;
- begin
- nxt_state := state;
- ierr := '0';
- istore_dout := '0';
-
- istart := start;
- iread := read;
- iwrite := write;
- iack := ack;
- istop := stop;
- iD := D;
-
- case (state) is
- -- init DS1621
- -- 1) send start condition
- -- 2) send slave address + write
- -- 3) check ack
- -- 4) send "access config" command (0xAC)
- -- 5) check ack
- -- 6) send config register data (0x00)
- -- 7) check ack
- -- 8) send stop condition
- -- 9) send start condition
- -- 10) send slave address + write
- -- 11) check ack
- -- 12) send "start conversion" command (0xEE)
- -- 13) check ack
- -- 14) send stop condition
-
- when i1 => -- send start condition, sent slave address + write
- nxt_state := i2;
- istart := '1';
- iread := '0';
- iwrite := '1';
- iack := '0';
- istop := '0';
- iD := (slave_addr & '0'); -- write to slave (R/W = '0')
-
- when i2 => -- send "access config" command
- if (cmd_ack = '1') then
- nxt_state := i3;
- -- check aknowledge bit
- if (lack = '1') then
- ierr := '1'; -- no acknowledge received from last command, expected ACK
- end if;
-
- istart := '0';
- iread := '0';
- iwrite := '1';
- iack := '0';
- istop := '0';
- iD := x"AC";
- end if;
-
- when i3 => -- send config register data, sent stop condition
- if (cmd_ack = '1') then
- nxt_state := i4;
- -- check aknowledge bit
- if (lack = '1') then
- ierr := '1'; -- no acknowledge received from last command, expected ACK
- end if;
-
- istart := '0';
- iread := '0';
- iwrite := '1';
- iack := '0';
- istop := '1';
- iD := x"00";
- end if;
-
- when i4 => -- send start condition, sent slave address + write
- if (cmd_ack = '1') then
- nxt_state := i5;
-
- istart := '1';
- iread := '0';
- iwrite := '1';
- iack := '0';
- istop := '0';
- iD := (slave_addr & '0'); -- write to slave (R/W = '0')
- end if;
-
- when i5 => -- send "start conversion" command + stop condition
- if (cmd_ack = '1') then
- nxt_state := t1;
- -- check aknowledge bit
- if (lack = '1') then
- ierr := '1'; -- no acknowledge received from last command, expected ACK
- end if;
-
- istart := '0';
- iread := '0';
- iwrite := '1';
- iack := '0';
- istop := '1';
- iD := x"EE";
- end if;
- -- read temperature
- -- 1) sent start condition
- -- 2) sent slave address + write
- -- 3) check ack
- -- 4) sent "read temperature" command (0xAA)
- -- 5) check ack
- -- 6) sent start condition
- -- 7) sent slave address + read
- -- 8) check ack
- -- 9) read msb
- -- 10) send ack
- -- 11) read lsb
- -- 12) send nack
- -- 13) send stop condition
-
- when t1 => -- send start condition, sent slave address + write
- if (cmd_ack = '1') then
- nxt_state := t2;
- -- check aknowledge bit
- if (lack = '1') then
- ierr := '1'; -- no acknowledge received from last command, expected ACK
- end if;
-
- istart := '1';
- iread := '0';
- iwrite := '1';
- iack := '0';
- istop := '0';
- iD := (slave_addr & '0'); -- write to slave (R/W = '0')
- end if;
-
- when t2 => -- send read temperature command
- if (cmd_ack = '1') then
- nxt_state := t3;
- -- check aknowledge bit
- if (lack = '1') then
- ierr := '1'; -- no acknowledge received from last command, expected ACK
- end if;
-
- istart := '0';
- iread := '0';
- iwrite := '1';
- iack := '0';
- istop := '0';
- iD := x"AA";
- end if;
-
- when t3 => -- send (repeated) start condition, send slave address + read
- if (cmd_ack = '1') then
- nxt_state := t4;
- -- check aknowledge bit
- if (lack = '1') then
- ierr := '1'; -- no acknowledge received, expected ACK
- end if;
-
- istart := '1';
- iread := '0';
- iwrite := '1';
- iack := '0';
- istop := '0';
- iD := (slave_addr & '1'); -- read from slave (R/W = '1')
- end if;
-
- when t4 => -- read MSB (hi-byte), send acknowledge
- if (cmd_ack = '1') then
- nxt_state := t5;
- -- check aknowledge bit
- if (lack = '1') then
- ierr := '1'; -- no acknowledge received from last command, expected ACK
- end if;
-
- istart := '0';
- iread := '1';
- iwrite := '0';
- iack := '0'; --ACK
- istop := '0';
- end if;
-
- when t5 => -- read LSB (lo-byte), send acknowledge, sent stop
- if (cmd_ack = '1') then
- nxt_state := t1;
-
- istart := '0';
- iread := '1';
- iwrite := '0';
- iack := '1'; --NACK
- istop := '1';
-
- istore_dout := '1';
- end if;
- end case;
-
- -- genregs
- if (nReset = '0') then
- state <= i1;
- error <= '0';
- store_dout <= '0';
-
- start <= '0';
- read <= '0';
- write <= '0';
- ack <= '0';
- stop <= '0';
- D <= (others => '0');
- elsif (clk'event and clk = '1') then
- state <= nxt_state;
- error <= ierr;
- store_dout <= istore_dout;
-
- start <= istart;
- read <= iread;
- write <= iwrite;
- ack <= iack;
- stop <= istop;
- D <= iD;
- end if;
- end process nxt_state_decoder;
- end block init_statemachine;
-
- -- store temp
- gen_dout : process(clk)
- begin
- if (clk'event and clk = '1') then
- if (store_dout = '1') then
- Dout <= i2c_dout;
- end if;
- end if;
- end process gen_dout;
-
-end architecture structural;
-
-
generated by cgit v1.2.3 (git 2.39.1) at 2024-11-18 07:33:42 +0000