////////////////////////////////////////////////////////////////////////////////// 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 [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; wire tx36_src_rdy, tx36_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; wire rx36_src_rdy, rx36_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, rx_data; wire [35:0] timedtx_data, loopbacktx_data, testtx_data, tx_data; wire timedrx_src_rdy, timedrx_dst_rdy, loopbackrx_src_rdy, loopbackrx_dst_rdy, testrx_src_rdy, testrx_dst_rdy, rx_src_rdy, rx_dst_rdy; wire timedtx_src_rdy, timedtx_dst_rdy, loopbacktx_src_rdy, loopbacktx_dst_rdy, testtx_src_rdy, testtx_dst_rdy, tx_src_rdy, tx_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 [7:0] rx_rate, tx_rate; wire rx_enable, tx_enable; wire underrun, overrun; wire sel_testtx, sel_loopbacktx; 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(tx_rate), .enable(tx_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(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(rx_rate), .enable(rx_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(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 endmodule // gpmc_async