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//////////////////////////////////////////////////////////////////////////////////
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,
input [2:0] gpif_misc,
// 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,
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,
output [31:0] debug0, output [31:0] debug1
);
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;
// ////////////////////////////////////////////////////////////////////
// TX Side
wire [17:0] tx18_data;
wire tx18_src_rdy, tx18_dst_rdy;
wire [35:0] tx36_data;
wire tx36_src_rdy, tx36_dst_rdy;
wire [17:0] 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(tx18_data), .src_rdy_o(tx18_src_rdy), .dst_rdy_i(tx18_dst_rdy),
.ctrl_o(ctrl_data), .ctrl_src_rdy_o(ctrl_src_rdy), .ctrl_dst_rdy_i(ctrl_dst_rdy),
.debug(debug_wr) );
fifo19_to_fifo36 #(.LE(1)) f18_to_f36
(.clk(fifo_clk), .reset(fifo_rst), .clear(0),
.f19_datain({1'b0,tx18_data}), .f19_src_rdy_i(tx18_src_rdy), .f19_dst_rdy_o(tx18_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(0),
.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 Side
wire [35:0] rx36_data;
wire rx36_src_rdy, rx36_dst_rdy;
wire [17:0] rx18_data;
wire rx18_src_rdy, rx18_dst_rdy;
wire [17:0] resp_data;
wire resp_src_rdy, resp_dst_rdy;
fifo_cascade #(.WIDTH(36), .SIZE(RXFIFOSIZE)) rx_fifo36
(.clk(fifo_clk), .reset(fifo_rst), .clear(0),
.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_f18 // FIXME Endianness?
(.clk(fifo_clk), .reset(fifo_rst), .clear(0),
.f36_datain(rx36_data), .f36_src_rdy_i(rx36_src_rdy), .f36_dst_rdy_o(rx36_dst_rdy),
.f19_dataout(rx18_data), .f19_src_rdy_o(rx18_src_rdy), .f19_dst_rdy_i(rx18_dst_rdy) );
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),
.sys_clk(fifo_clk), .sys_rst(fifo_rst),
.data_i(rx18_data), .src_rdy_i(rx18_src_rdy), .dst_rdy_o(rx18_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_data), .src_rdy_o(resp_src_rdy), .dst_rdy_i(resp_dst_rdy),
.wb_adr_o(), .wb_dat_mosi(), .wb_dat_miso(),
.wb_sel_o(), .wb_cyc_o(), .wb_stb_o(), .wb_we_o(), .wb_ack_i(),
.debug0(), .debug1());
*/
// ////////////////////////////////////////////
// DEBUG
// Loopback for testing
assign resp_data = ctrl_data;
assign resp_src_rdy = ctrl_src_rdy;
assign ctrl_dst_rdy = resp_dst_rdy;
//assign rx_data_i = tx_data_o;
//assign rx_src_rdy_i = tx_src_rdy_o;
//assign tx_dst_rdy_i = rx_dst_rdy_o;
assign debug0 = { 5'd0, gpif_misc[2:0], 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, rx18_src_rdy, rx18_dst_rdy, resp_src_rdy, resp_dst_rdy},
{ tx_src_rdy_o, tx_dst_rdy_i, tx18_src_rdy, tx18_dst_rdy, tx36_src_rdy, tx36_dst_rdy, ctrl_src_rdy, ctrl_dst_rdy} };
endmodule // gpif
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