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-rw-r--r--fpga/usrp2/gpif/gpif.v185
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diff --git a/fpga/usrp2/gpif/gpif.v b/fpga/usrp2/gpif/gpif.v
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-//
-// Copyright 2011 Ettus Research LLC
-//
-// 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 3 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, see <http://www.gnu.org/licenses/>.
-//
-
-//////////////////////////////////////////////////////////////////////////////////
-
-module gpif
- #(parameter TXFIFOSIZE = 11, parameter RXFIFOSIZE = 11)
- (// GPIF signals
- input gpif_clk, input gpif_rst,
- inout [15:0] gpif_d, input [3:0] gpif_ctl, output [3:0] gpif_rdy,
- output [2:0] gpif_misc,
-
- // Wishbone signals
- input wb_clk, input wb_rst,
- output [15:0] wb_adr_o, output [15:0] wb_dat_mosi, input [15:0] wb_dat_miso,
- output [1:0] wb_sel_o, output wb_cyc_o, output wb_stb_o, output wb_we_o, input wb_ack_i,
- input [7:0] triggers,
-
- // FIFO interface
- input fifo_clk, input fifo_rst, input clear_tx, input clear_rx,
- output [35:0] tx_data_o, output tx_src_rdy_o, input tx_dst_rdy_i,
- input [35:0] rx_data_i, input rx_src_rdy_i, output rx_dst_rdy_o,
- input [35:0] tx_err_data_i, input tx_err_src_rdy_i, output tx_err_dst_rdy_o,
-
- output tx_underrun, output rx_overrun,
- input [7:0] frames_per_packet,
- output [31:0] debug0, output [31:0] debug1
- );
-
- assign tx_underrun = 0;
- assign rx_overrun = 0;
-
- wire WR = gpif_ctl[0];
- wire RD = gpif_ctl[1];
- wire OE = gpif_ctl[2];
- wire EP = gpif_ctl[3];
-
- wire CF, CE, DF, DE;
-
- assign gpif_rdy = { CF, CE, DF, DE };
-
- wire [15:0] gpif_d_out;
- assign gpif_d = OE ? gpif_d_out : 16'bz;
-
- wire [15:0] gpif_d_copy = gpif_d;
-
- wire [31:0] debug_rd, debug_wr, debug_split0, debug_split1;
-
- // ////////////////////////////////////////////////////////////////////
- // TX Data Path
-
- wire [18:0] tx19_data;
- wire tx19_src_rdy, tx19_dst_rdy;
- wire [35:0] tx36_data;
- wire tx36_src_rdy, tx36_dst_rdy;
-
- wire [18:0] ctrl_data;
- wire ctrl_src_rdy, ctrl_dst_rdy;
-
- gpif_wr gpif_wr
- (.gpif_clk(gpif_clk), .gpif_rst(gpif_rst),
- .gpif_data(gpif_d), .gpif_wr(WR), .gpif_ep(EP),
- .gpif_full_d(DF), .gpif_full_c(CF),
-
- .sys_clk(fifo_clk), .sys_rst(fifo_rst),
- .data_o(tx19_data), .src_rdy_o(tx19_src_rdy), .dst_rdy_i(tx19_dst_rdy),
- .ctrl_o(ctrl_data), .ctrl_src_rdy_o(ctrl_src_rdy), .ctrl_dst_rdy_i(ctrl_dst_rdy),
- .debug(debug_wr) );
-
- // join vita packets which are longer than one frame, drop frame padding
- wire [18:0] refr_data;
- wire refr_src_rdy, refr_dst_rdy;
-
- packet_reframer tx_packet_reframer
- (.clk(fifo_clk), .reset(fifo_rst), .clear(clear_tx),
- .data_i(tx19_data), .src_rdy_i(tx19_src_rdy), .dst_rdy_o(tx19_dst_rdy),
- .data_o(refr_data), .src_rdy_o(refr_src_rdy), .dst_rdy_i(refr_dst_rdy));
-
- fifo19_to_fifo36 #(.LE(1)) f19_to_f36
- (.clk(fifo_clk), .reset(fifo_rst), .clear(0),
- .f19_datain(refr_data), .f19_src_rdy_i(refr_src_rdy), .f19_dst_rdy_o(refr_dst_rdy),
- .f36_dataout(tx36_data), .f36_src_rdy_o(tx36_src_rdy), .f36_dst_rdy_i(tx36_dst_rdy));
-
- fifo_cascade #(.WIDTH(36), .SIZE(TXFIFOSIZE)) tx_fifo36
- (.clk(fifo_clk), .reset(fifo_rst), .clear(clear_tx),
- .datain(tx36_data), .src_rdy_i(tx36_src_rdy), .dst_rdy_o(tx36_dst_rdy),
- .dataout(tx_data_o), .src_rdy_o(tx_src_rdy_o), .dst_rdy_i(tx_dst_rdy_i));
-
- // ////////////////////////////////////////////
- // RX Data Path
-
- wire [35:0] rx36_data;
- wire rx36_src_rdy, rx36_dst_rdy;
- wire [18:0] rx19_data, splt_data;
- wire rx19_src_rdy, rx19_dst_rdy, splt_src_rdy, splt_dst_rdy;
- wire [18:0] resp_data, resp_int1, resp_int2;
- wire resp_src_rdy, resp_dst_rdy;
- wire resp_src_rdy_int1, resp_dst_rdy_int1, resp_src_rdy_int2, resp_dst_rdy_int2;
-
- fifo_cascade #(.WIDTH(36), .SIZE(RXFIFOSIZE)) rx_fifo36
- (.clk(fifo_clk), .reset(fifo_rst), .clear(clear_rx),
- .datain(rx_data_i), .src_rdy_i(rx_src_rdy_i), .dst_rdy_o(rx_dst_rdy_o),
- .dataout(rx36_data), .src_rdy_o(rx36_src_rdy), .dst_rdy_i(rx36_dst_rdy));
-
- fifo36_to_fifo19 #(.LE(1)) f36_to_f19
- (.clk(fifo_clk), .reset(fifo_rst), .clear(clear_rx),
- .f36_datain(rx36_data), .f36_src_rdy_i(rx36_src_rdy), .f36_dst_rdy_o(rx36_dst_rdy),
- .f19_dataout(rx19_data), .f19_src_rdy_o(rx19_src_rdy), .f19_dst_rdy_i(rx19_dst_rdy) );
-
- packet_splitter #(.FRAME_LEN(256)) packet_splitter
- (.clk(fifo_clk), .reset(fifo_rst), .clear(clear_rx),
- .frames_per_packet(frames_per_packet),
- .data_i(rx19_data), .src_rdy_i(rx19_src_rdy), .dst_rdy_o(rx19_dst_rdy),
- .data_o(splt_data), .src_rdy_o(splt_src_rdy), .dst_rdy_i(splt_dst_rdy),
- .debug0(debug_split0), .debug1(debug_split1));
-
- gpif_rd gpif_rd
- (.gpif_clk(gpif_clk), .gpif_rst(gpif_rst),
- .gpif_data(gpif_d_out), .gpif_rd(RD), .gpif_ep(EP),
- .gpif_empty_d(DE), .gpif_empty_c(CE), .gpif_flush(gpif_misc[0]),
-
- .sys_clk(fifo_clk), .sys_rst(fifo_rst),
- .data_i(splt_data), .src_rdy_i(splt_src_rdy), .dst_rdy_o(splt_dst_rdy),
- .resp_i(resp_data), .resp_src_rdy_i(resp_src_rdy), .resp_dst_rdy_o(resp_dst_rdy),
- .debug(debug_rd) );
-
- // ////////////////////////////////////////////////////////////////////
- // FIFO to Wishbone interface
-
- fifo_to_wb fifo_to_wb
- (.clk(fifo_clk), .reset(fifo_rst), .clear(0),
- .data_i(ctrl_data), .src_rdy_i(ctrl_src_rdy), .dst_rdy_o(ctrl_dst_rdy),
- .data_o(resp_int1), .src_rdy_o(resp_src_rdy_int1), .dst_rdy_i(resp_dst_rdy_int1),
- .wb_adr_o(wb_adr_o), .wb_dat_mosi(wb_dat_mosi), .wb_dat_miso(wb_dat_miso), .wb_sel_o(wb_sel_o),
- .wb_cyc_o(wb_cyc_o), .wb_stb_o(wb_stb_o), .wb_we_o(wb_we_o), .wb_ack_i(wb_ack_i),
- .triggers(triggers),
- .debug0(), .debug1());
-
- wire [18:0] tx_err19_data;
- wire tx_err19_src_rdy, tx_err19_dst_rdy;
-
- fifo36_to_fifo19 #(.LE(1)) f36_to_f19_txerr
- (.clk(fifo_clk), .reset(fifo_rst), .clear(clear_rx),
- .f36_datain(tx_err_data_i), .f36_src_rdy_i(tx_err_src_rdy_i), .f36_dst_rdy_o(tx_err_dst_rdy_o),
- .f19_dataout(tx_err19_data), .f19_src_rdy_o(tx_err19_src_rdy), .f19_dst_rdy_i(tx_err19_dst_rdy) );
-
- fifo19_mux #(.prio(0)) mux_err_stream
- (.clk(wb_clk), .reset(wb_rst), .clear(0),
- .data0_i(resp_int1), .src0_rdy_i(resp_src_rdy_int1), .dst0_rdy_o(resp_dst_rdy_int1),
- .data1_i(tx_err19_data), .src1_rdy_i(tx_err19_src_rdy), .dst1_rdy_o(tx_err19_dst_rdy),
- .data_o(resp_int2), .src_rdy_o(resp_src_rdy_int2), .dst_rdy_i(resp_dst_rdy_int2));
-
- fifo19_pad #(.LENGTH(16)) fifo19_pad
- (.clk(fifo_clk), .reset(fifo_rst), .clear(0),
- .data_i(resp_int2), .src_rdy_i(resp_src_rdy_int2), .dst_rdy_o(resp_dst_rdy_int2),
- .data_o(resp_data), .src_rdy_o(resp_src_rdy), .dst_rdy_i(resp_dst_rdy));
-
- // ////////////////////////////////////////////
- // DEBUG
-
- //assign debug0 = { rx19_src_rdy, rx19_dst_rdy, resp_src_rdy, resp_dst_rdy, gpif_ctl[3:0], gpif_rdy[3:0],
- // gpif_d_copy[15:0] };
-
- //assign debug1 = { { debug_rd[15:8] },
- // { debug_rd[7:0] },
- // { rx_src_rdy_i, rx_dst_rdy_o, rx36_src_rdy, rx36_dst_rdy, rx19_src_rdy, rx19_dst_rdy, resp_src_rdy, resp_dst_rdy},
- // { tx_src_rdy_o, tx_dst_rdy_i, tx19_src_rdy, tx19_dst_rdy, tx36_src_rdy, tx36_dst_rdy, ctrl_src_rdy, ctrl_dst_rdy} };
-
- assign debug0 = { gpif_ctl[3:0], gpif_rdy[3:0], debug_split0[23:0] };
- assign debug1 = { gpif_misc[0], debug_rd[14:0], debug_split1[15:8], debug_split1[7:0] };
-endmodule // gpif
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