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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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