diff options
Diffstat (limited to 'fpga/usrp2/opencores/i2c/rtl/verilog')
5 files changed, 0 insertions, 1249 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 - |