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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 gpmc_async
#(parameter TXFIFOSIZE = 11,
parameter RXFIFOSIZE = 11,
parameter BUSDEBUG = 1)
(// GPMC signals
input arst,
input EM_CLK, inout [15:0] EM_D, input [10:1] EM_A, input [1:0] EM_NBE,
input EM_WAIT0, input EM_NCS4, input EM_NCS6, input EM_NWE, input EM_NOE,
// GPIOs for FIFO signalling
output rx_have_data, output tx_have_space, output reg bus_error, input bus_reset,
// Wishbone signals
input wb_clk, input wb_rst,
output [10:0] 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,
// 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 [15:0] tx_frame_len, output [15:0] rx_frame_len,
output tx_underrun, output rx_overrun,
input [7:0] test_rate, input [3:0] test_ctrl,
output [31:0] debug
);
wire EM_output_enable = (~EM_NOE & (~EM_NCS4 | ~EM_NCS6));
wire [15:0] EM_D_fifo;
wire [15:0] EM_D_wb;
assign EM_D = ~EM_output_enable ? 16'bz : ~EM_NCS4 ? EM_D_fifo : EM_D_wb;
wire bus_error_tx, bus_error_rx;
always @(posedge fifo_clk)
if(fifo_rst | clear_tx | clear_rx)
bus_error <= 0;
else
bus_error <= bus_error_tx | bus_error_rx;
// CS4 is RAM_2PORT for DATA PATH (high-speed data)
// Writes go into one RAM, reads come from the other
// CS6 is for CONTROL PATH (wishbone)
// ////////////////////////////////////////////
// TX Data Path
wire [17:0] tx18_data, tx18b_data;
wire tx18_src_rdy, tx18_dst_rdy, tx18b_src_rdy, tx18b_dst_rdy;
wire [15:0] tx_fifo_space;
wire [35:0] tx36_data, tx_data;
wire tx36_src_rdy, tx36_dst_rdy, tx_src_rdy, tx_dst_rdy;
gpmc_to_fifo_async gpmc_to_fifo_async
(.EM_D(EM_D), .EM_NBE(EM_NBE), .EM_NCS(EM_NCS4), .EM_NWE(EM_NWE),
.fifo_clk(fifo_clk), .fifo_rst(fifo_rst), .clear(clear_tx),
.data_o(tx18_data), .src_rdy_o(tx18_src_rdy), .dst_rdy_i(tx18_dst_rdy),
.frame_len(tx_frame_len), .fifo_space(tx_fifo_space), .fifo_ready(tx_have_space),
.bus_error(bus_error_tx) );
fifo_cascade #(.WIDTH(18), .SIZE(10)) tx_fifo
(.clk(fifo_clk), .reset(fifo_rst), .clear(clear_tx),
.datain(tx18_data), .src_rdy_i(tx18_src_rdy), .dst_rdy_o(tx18_dst_rdy), .space(tx_fifo_space),
.dataout(tx18b_data), .src_rdy_o(tx18b_src_rdy), .dst_rdy_i(tx18b_dst_rdy), .occupied());
fifo19_to_fifo36 #(.LE(1)) f19_to_f36 // Little endian because ARM is LE
(.clk(fifo_clk), .reset(fifo_rst), .clear(clear_tx),
.f19_datain({1'b0,tx18b_data}), .f19_src_rdy_i(tx18b_src_rdy), .f19_dst_rdy_o(tx18b_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), .src_rdy_o(tx_src_rdy), .dst_rdy_i(tx_dst_rdy));
// ////////////////////////////////////////////
// RX Data Path
wire [17:0] rx18_data, rx18b_data;
wire rx18_src_rdy, rx18_dst_rdy, rx18b_src_rdy, rx18b_dst_rdy;
wire [15:0] rx_fifo_space;
wire [35:0] rx36_data, rx_data;
wire rx36_src_rdy, rx36_dst_rdy, rx_src_rdy, rx_dst_rdy;
wire dummy;
fifo_cascade #(.WIDTH(36), .SIZE(RXFIFOSIZE)) rx_fifo36
(.clk(fifo_clk), .reset(fifo_rst), .clear(clear_rx),
.datain(rx_data), .src_rdy_i(rx_src_rdy), .dst_rdy_o(rx_dst_rdy),
.dataout(rx36_data), .src_rdy_o(rx36_src_rdy), .dst_rdy_i(rx36_dst_rdy));
fifo36_to_fifo19 #(.LE(1)) f36_to_f19 // Little endian because ARM is LE
(.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({dummy,rx18_data}), .f19_src_rdy_o(rx18_src_rdy), .f19_dst_rdy_i(rx18_dst_rdy) );
fifo_cascade #(.WIDTH(18), .SIZE(12)) rx_fifo
(.clk(fifo_clk), .reset(fifo_rst), .clear(clear_rx),
.datain(rx18_data), .src_rdy_i(rx18_src_rdy), .dst_rdy_o(rx18_dst_rdy), .space(rx_fifo_space),
.dataout(rx18b_data), .src_rdy_o(rx18b_src_rdy), .dst_rdy_i(rx18b_dst_rdy), .occupied());
fifo_to_gpmc_async fifo_to_gpmc_async
(.clk(fifo_clk), .reset(fifo_rst), .clear(clear_rx),
.data_i(rx18b_data), .src_rdy_i(rx18b_src_rdy), .dst_rdy_o(rx18b_dst_rdy),
.EM_D(EM_D_fifo), .EM_NCS(EM_NCS4), .EM_NOE(EM_NOE),
.frame_len(rx_frame_len) );
wire [31:0] pkt_count;
fifo_watcher fifo_watcher
(.clk(fifo_clk), .reset(fifo_rst), .clear(clear_rx),
.src_rdy1(rx18_src_rdy), .dst_rdy1(rx18_dst_rdy), .sof1(rx18_data[16]), .eof1(rx18_data[17]),
.src_rdy2(rx18b_src_rdy), .dst_rdy2(rx18b_dst_rdy), .sof2(rx18b_data[16]), .eof2(rx18b_data[17]),
.have_packet(rx_have_data), .length(rx_frame_len), .bus_error(bus_error_rx),
.debug(pkt_count));
// ////////////////////////////////////////////
// Control path on CS6
gpmc_wb gpmc_wb
(.EM_CLK(EM_CLK), .EM_D_in(EM_D), .EM_D_out(EM_D_wb), .EM_A(EM_A), .EM_NBE(EM_NBE),
.EM_NCS(EM_NCS6), .EM_NWE(EM_NWE), .EM_NOE(EM_NOE),
.wb_clk(wb_clk), .wb_rst(wb_rst),
.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) );
// assign debug = pkt_count;
// ////////////////////////////////////////////
// Test support, traffic generator, loopback, etc.
// RX side muxes test data into the same stream
wire [35:0] timedrx_data, loopbackrx_data, testrx_data;
wire [35:0] timedtx_data, loopbacktx_data, testtx_data;
wire timedrx_src_rdy, timedrx_dst_rdy, loopbackrx_src_rdy, loopbackrx_dst_rdy,
testrx_src_rdy, testrx_dst_rdy;
wire timedtx_src_rdy, timedtx_dst_rdy, loopbacktx_src_rdy, loopbacktx_dst_rdy,
testtx_src_rdy, testtx_dst_rdy;
wire timedrx_src_rdy_int, timedrx_dst_rdy_int, timedtx_src_rdy_int, timedtx_dst_rdy_int;
wire [31:0] total, crc_err, seq_err, len_err;
wire sel_testtx = test_ctrl[0];
wire sel_loopbacktx = test_ctrl[1];
wire pkt_src_enable = test_ctrl[2];
wire pkt_sink_enable = test_ctrl[3];
fifo36_mux rx_test_mux_lvl_1
(.clk(fifo_clk), .reset(fifo_rst), .clear(clear_rx),
.data0_i(timedrx_data), .src0_rdy_i(timedrx_src_rdy), .dst0_rdy_o(timedrx_dst_rdy),
.data1_i(loopbackrx_data), .src1_rdy_i(loopbackrx_src_rdy), .dst1_rdy_o(loopbackrx_dst_rdy),
.data_o(testrx_data), .src_rdy_o(testrx_src_rdy), .dst_rdy_i(testrx_dst_rdy));
fifo36_mux rx_test_mux_lvl_2
(.clk(fifo_clk), .reset(fifo_rst), .clear(clear_rx),
.data0_i(testrx_data), .src0_rdy_i(testrx_src_rdy), .dst0_rdy_o(testrx_dst_rdy),
.data1_i(rx_data_i), .src1_rdy_i(rx_src_rdy_i), .dst1_rdy_o(rx_dst_rdy_o),
.data_o(rx_data), .src_rdy_o(rx_src_rdy), .dst_rdy_i(rx_dst_rdy));
fifo_short #(.WIDTH(36)) loopback_fifo
(.clk(fifo_clk), .reset(fifo_rst), .clear(clear_tx | clear_rx),
.datain(loopbacktx_data), .src_rdy_i(loopbacktx_src_rdy), .dst_rdy_o(loopbacktx_dst_rdy),
.dataout(loopbackrx_data), .src_rdy_o(loopbackrx_src_rdy), .dst_rdy_i(loopbackrx_dst_rdy));
// Crossbar used as a demux for switching TX stream to main DSP or to test logic
crossbar36 tx_crossbar_lvl_1
(.clk(fifo_clk), .reset(fifo_rst), .clear(clear_tx),
.cross(sel_testtx),
.data0_i(tx_data), .src0_rdy_i(tx_src_rdy), .dst0_rdy_o(tx_dst_rdy),
.data1_i(tx_data), .src1_rdy_i(1'b0), .dst1_rdy_o(), // No 2nd input
.data0_o(tx_data_o), .src0_rdy_o(tx_src_rdy_o), .dst0_rdy_i(tx_dst_rdy_i),
.data1_o(testtx_data), .src1_rdy_o(testtx_src_rdy), .dst1_rdy_i(testtx_dst_rdy) );
crossbar36 tx_crossbar_lvl_2
(.clk(fifo_clk), .reset(fifo_rst), .clear(clear_tx),
.cross(sel_loopbacktx),
.data0_i(testtx_data), .src0_rdy_i(testtx_src_rdy), .dst0_rdy_o(testtx_dst_rdy),
.data1_i(testtx_data), .src1_rdy_i(1'b0), .dst1_rdy_o(), // No 2nd input
.data0_o(timedtx_data), .src0_rdy_o(timedtx_src_rdy), .dst0_rdy_i(timedtx_dst_rdy),
.data1_o(loopbacktx_data), .src1_rdy_o(loopbacktx_src_rdy), .dst1_rdy_i(loopbacktx_dst_rdy) );
// Fixed rate TX traffic consumer
fifo_pacer tx_pacer
(.clk(fifo_clk), .reset(fifo_rst), .rate(test_rate), .enable(pkt_sink_enable),
.src1_rdy_i(timedtx_src_rdy), .dst1_rdy_o(timedtx_dst_rdy),
.src2_rdy_o(timedtx_src_rdy_int), .dst2_rdy_i(timedtx_dst_rdy_int),
.underrun(tx_underrun), .overrun());
packet_verifier32 pktver32
(.clk(fifo_clk), .reset(fifo_rst), .clear(clear_tx),
.data_i(timedtx_data), .src_rdy_i(timedtx_src_rdy_int), .dst_rdy_o(timedtx_dst_rdy_int),
.total(total), .crc_err(crc_err), .seq_err(seq_err), .len_err(len_err));
// Fixed rate RX traffic generator
packet_generator32 pktgen32
(.clk(fifo_clk), .reset(fifo_rst), .clear(clear_rx),
.header({len_err,seq_err,crc_err,total}),
.data_o(timedrx_data), .src_rdy_o(timedrx_src_rdy_int), .dst_rdy_i(timedrx_dst_rdy_int));
fifo_pacer rx_pacer
(.clk(fifo_clk), .reset(fifo_rst), .rate(test_rate), .enable(pkt_src_enable),
.src1_rdy_i(timedrx_src_rdy_int), .dst1_rdy_o(timedrx_dst_rdy_int),
.src2_rdy_o(timedrx_src_rdy), .dst2_rdy_i(timedrx_dst_rdy),
.underrun(), .overrun(rx_overrun));
// FIXME -- hook up crossbar controls
// // FIXME -- collect error stats
// FIXME -- set rates and enables on pacers
// FIXME -- make sure packet completes before we shutoff
// FIXME -- handle overrun and underrun
wire [0:17] dummy18;
assign debug = {8'd0,
test_rate,
pkt_src_enable, pkt_sink_enable, timedrx_src_rdy_int, timedrx_dst_rdy_int,
timedrx_src_rdy, timedrx_dst_rdy,
testrx_src_rdy, testrx_dst_rdy,
rx_src_rdy, rx_dst_rdy,
rx36_src_rdy, rx36_dst_rdy,
rx18_src_rdy, rx18_dst_rdy,
rx18b_src_rdy, rx18b_dst_rdy};
endmodule // gpmc_async
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