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Diffstat (limited to 'sdr_lib/bus_interface.v')
| -rwxr-xr-x | sdr_lib/bus_interface.v | 213 |
1 files changed, 0 insertions, 213 deletions
diff --git a/sdr_lib/bus_interface.v b/sdr_lib/bus_interface.v deleted file mode 100755 index b326889c0..000000000 --- a/sdr_lib/bus_interface.v +++ /dev/null @@ -1,213 +0,0 @@ -// -*- verilog -*- -// -// USRP - Universal Software Radio Peripheral -// -// Copyright (C) 2003 Matt Ettus -// -// This program is free software; you can redistribute it and/or modify -// it under the terms of the GNU General Public License as published by -// the Free Software Foundation; either version 2 of the License, or -// (at your option) any later version. -// -// This program is distributed in the hope that it will be useful, -// but WITHOUT ANY WARRANTY; without even the implied warranty of -// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the -// GNU General Public License for more details. -// -// You should have received a copy of the GNU General Public License -// along with this program; if not, write to the Free Software -// Foundation, Inc., 51 Franklin Street, Boston, MA 02110-1301 USA -// - -// Interface to Cypress FX2 bus -// A packet is 512 Bytes. Each fifo line is 4 bytes -// Fifo has 1024 or 2048 lines - -module bus_interface - ( input usbclk, - input reset, - inout [15:0] usbdata, // TRISTATE - input wire [5:0] usbctl, - output wire [5:0] usbrdy, - output [31:0] txdata, - input [31:0] rxdata, - input txclk, - input txstrobe, - input rxclk, - input rxstrobe, - output [11:0] debugbus, - input clear_status - ); - - parameter IN_CHANNELS = 1; - parameter OUT_CHANNELS = 1; - parameter bitmask = (IN_CHANNELS*2)-1; - - wire have_space, have_pkt_rdy; - wire WR, RD, OE; - reg tx_underrun, rx_overrun; - - assign WR = usbctl[0]; - assign RD = usbctl[1]; - assign OE = usbctl[2]; - - assign usbrdy[0] = have_space; - assign usbrdy[1] = have_pkt_rdy; - assign usbrdy[2] = tx_underrun; - assign usbrdy[3] = rx_overrun; - - reg [IN_CHANNELS*2*16-1:0] fifo_in; - wire [OUT_CHANNELS*2*16-1:0] fifo_out; - - wire [15:0] usbdata_in = usbdata; - - reg select_out; - reg select_in; - - reg commit; - reg rd_next; - reg [15:0] usbdata_out; - wire [10:0] txfifolevel,rxfifolevel; - reg [8:0] write_count; - wire tx_empty; - wire tx_full; - wire rx_empty; - wire rx_full; - wire [31:0] txd; - wire rdreq; - - // Tri-state bus macro - bustri bustri(.data(usbdata_out), - .enabledt(OE), - .tridata(usbdata) ); - - ////////////////////////////////////////////// - // TX Side (USB --> DAC) - always @(posedge usbclk, posedge reset) - begin - if(reset) - begin - fifo_in <= #1 0; - write_count <= #1 0; - end - else - if(WR & ~write_count[8]) - begin - case(write_count[0]) - 1'b0 : fifo_in[31:16] <= #1 usbdata_in; // I - 1'b1 : fifo_in[15:0] <= #1 usbdata_in; // Q - endcase - write_count <= #1 write_count + 9'd1; - end - else - write_count <= #1 WR ? write_count : 9'b0; - end - - always @(posedge usbclk) - if(reset) - commit <= #1 1'b0; - else - if(write_count[0] && ~write_count[8] && WR) - commit <= #1 1'b1; - else - commit <= #1 1'b0; - - assign rdreq = txstrobe & !tx_empty; - assign txdata = tx_empty ? 32'b0 : txd; - - always @(posedge txclk) - if(reset) - tx_underrun <= 1'b0; - else if(txstrobe & tx_empty) - tx_underrun <= 1'b1; - else if(clear_status) - tx_underrun <= 1'b0; - - fifo_1c_2k txfifo (.data ( fifo_in ), - .wrreq ( commit ), - .wrclk ( usbclk ), - - .q ( txd ), - .rdreq ( rdreq), - .rdclk ( txclk ), - - .aclr ( reset ), - - .rdempty ( tx_empty ), - .rdusedw ( ), - .wrfull ( tx_full ), - .wrusedw ( txfifolevel ) - ); - - assign have_space = (txfifolevel <= (2048-128)); - - ////////////////////////////// - // Receive FIFO (ADC --> USB) - - always @(posedge rxclk) - if(reset) - rx_overrun <= 1'b0; - else if(rxstrobe & rx_full) - rx_overrun <= 1'b1; - else if(clear_status) - rx_overrun <= 1'b0; - - always @(select_out, fifo_out) - case(select_out) - 0 : usbdata_out = fifo_out[31:16]; // I - 1 : usbdata_out = fifo_out[15:0]; // Q - endcase - -/* - always @(posedge usbclk, posedge reset) - if(reset) - usbdata_out <= #1 16'b0; - else - if(select_out) - usbdata_out = fifo_out[31:16]; - else - usbdata_out = fifo_out[15:0]; - */ - - always @(negedge usbclk, posedge reset) - if(reset) - select_out <= #1 1'b0; - else if(~RD) - select_out <= #1 1'b0; - else - select_out <= #1 ~select_out; - - fifo_1c_2k rxfifo (.data ( rxdata ), // counter ), - .wrreq (rxstrobe & ~rx_full ), - .wrclk ( rxclk ), - - .q ( fifo_out ), - .rdreq ( select_out ),// & RD ), // FIXME - .rdclk ( usbclk ), - - .aclr ( reset ), - - .rdempty ( rx_empty ), - .rdusedw ( rxfifolevel ), - .wrfull ( rx_full ), - .wrusedw ( ) - ); - - assign have_pkt_rdy = (rxfifolevel >= 128); - - // Debugging Aids - assign debugbus[0] = tx_underrun; - assign debugbus[1] = rx_overrun; - assign debugbus[2] = tx_empty; - assign debugbus[3] = tx_full; - assign debugbus[4] = rx_empty; - assign debugbus[5] = rx_full; - assign debugbus[6] = txstrobe; - assign debugbus[7] = rxstrobe; - assign debugbus[8] = select_out; - assign debugbus[9] = rxstrobe & ~rx_full; - assign debugbus[10] = have_space; - assign debugbus[11] = have_pkt_rdy; - -endmodule // bus_interface - |