//
// Copyright 2011-2012 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 vita_tx_chain
  #(parameter BASE=0,
    parameter FIFOSIZE=10,
    parameter POST_ENGINE_FIFOSIZE=10,
    parameter REPORT_ERROR=0,
    parameter DO_FLOW_CONTROL=0,
    parameter PROT_ENG_FLAGS=0,
    parameter USE_TRANS_HEADER=0,
    parameter DSP_NUMBER=0)
   (input clk, input reset,
    input set_stb, input [7:0] set_addr, input [31:0] set_data,
    input set_stb_user, input [7:0] set_addr_user, input [31:0] set_data_user,
    input [63:0] vita_time,
    input [35:0] tx_data_i, input tx_src_rdy_i, output tx_dst_rdy_o,
    output [35:0] err_data_o, output err_src_rdy_o, input err_dst_rdy_i,
    output [31:0] sample, input strobe,
    output underrun, output run, output clear_o,
    output [31:0] debug);

   localparam MAXCHAN = 1;
   localparam FIFOWIDTH = 5+64+16+(32*MAXCHAN);

   wire [FIFOWIDTH-1:0] tx1_data;
   wire 		tx1_src_rdy, tx1_dst_rdy;
   wire [31:0] 		streamid, message;
   wire 		trigger, sent;
   wire [31:0] 		debug_vtc, debug_vtd, debug_tx_dsp;

   wire 		error, packet_consumed, ack;
   wire [31:0] 		error_code;
   wire 		clear_seqnum;
   wire [31:0] 		current_seqnum;

   wire clear, flush;
   assign clear_o = clear;
   assign underrun = error;
   assign message = error_code;

   setting_reg #(.my_addr(BASE+0), .width(1)) sr
     (.clk(clk),.rst(reset),.strobe(set_stb),.addr(set_addr),
      .in(set_data),.out(flush),.changed(clear));

   setting_reg #(.my_addr(BASE+2), .at_reset(0)) sr_streamid
     (.clk(clk),.rst(reset),.strobe(set_stb),.addr(set_addr),
      .in(set_data),.out(streamid),.changed(clear_seqnum));

    //flush control - full rate vacuum of input until flush cleared
    wire tx_dst_rdy_int, tx_src_rdy_int;
    wire [35:0] tx_data_int;
    valve36 flusher_valve
    (.clk(clk), .reset(reset), .clear(clear & flush), .shutoff(flush),
     .data_i(tx_data_i), .src_rdy_i(tx_src_rdy_i), .dst_rdy_o(tx_dst_rdy_o),
     .data_o(tx_data_int), .src_rdy_o(tx_src_rdy_int), .dst_rdy_i(tx_dst_rdy_int));

   wire [35:0] tx_data_int1;
   wire tx_src_rdy_int1, tx_dst_rdy_int1;

    generate
    if (FIFOSIZE==0) begin
        assign tx_data_int1 = tx_data_int;
        assign tx_src_rdy_int1 = tx_src_rdy_int;
        assign tx_dst_rdy_int = tx_dst_rdy_int1;
    end
    else begin
       wire [FIFOSIZE-1:0] access_adr, access_len;
       wire 	       access_we, access_stb, access_ok, access_done, access_skip_read;
       wire [35:0] 	       dsp_to_buf, buf_to_dsp;
       wire [35:0] tx_data_int0;
       wire tx_src_rdy_int0, tx_dst_rdy_int0;

       double_buffer #(.BUF_SIZE(FIFOSIZE)) db
         (.clk(clk),.reset(reset),.clear(clear),
          .access_we(access_we), .access_stb(access_stb), .access_ok(access_ok), .access_done(access_done),
          .access_skip_read(access_skip_read), .access_adr(access_adr), .access_len(access_len),
          .access_dat_i(dsp_to_buf), .access_dat_o(buf_to_dsp),

          .data_i(tx_data_int), .src_rdy_i(tx_src_rdy_int), .dst_rdy_o(tx_dst_rdy_int),
          .data_o(tx_data_int0), .src_rdy_o(tx_src_rdy_int0), .dst_rdy_i(tx_dst_rdy_int0));

       vita_tx_engine_glue #(.DSPNO(DSP_NUMBER), .MAIN_SETTINGS_BASE(BASE+1), .BUF_SIZE(FIFOSIZE), .HEADER_OFFSET(USE_TRANS_HEADER)) dspengine_tx
         (.clock(clk),.reset(reset),.clear(clear),
          .set_stb_main(set_stb), .set_addr_main(set_addr), .set_data_main(set_data),
          .set_stb_user(set_stb_user), .set_addr_user(set_addr_user), .set_data_user(set_data_user),
          .access_we(access_we), .access_stb(access_stb), .access_ok(access_ok), .access_done(access_done),
          .access_skip_read(access_skip_read), .access_adr(access_adr), .access_len(access_len),
          .access_dat_i(buf_to_dsp), .access_dat_o(dsp_to_buf));

       fifo_cascade #(.WIDTH(36), .SIZE(POST_ENGINE_FIFOSIZE)) post_engine_buffering(
        .clk(clk), .reset(reset), .clear(clear),
        .datain(tx_data_int0), .src_rdy_i(tx_src_rdy_int0), .dst_rdy_o(tx_dst_rdy_int0),
        .dataout(tx_data_int1), .src_rdy_o(tx_src_rdy_int1), .dst_rdy_i(tx_dst_rdy_int1));

    end
    endgenerate

   vita_tx_deframer #(.BASE(BASE), 
		      .MAXCHAN(MAXCHAN), 
		      .USE_TRANS_HEADER(USE_TRANS_HEADER)) 
   vita_tx_deframer
     (.clk(clk), .reset(reset), .clear(clear), .clear_seqnum(clear_seqnum),
      .set_stb(set_stb),.set_addr(set_addr),.set_data(set_data),
      .data_i(tx_data_int1), .src_rdy_i(tx_src_rdy_int1), .dst_rdy_o(tx_dst_rdy_int1),
      .sample_fifo_o(tx1_data), .sample_fifo_src_rdy_o(tx1_src_rdy), .sample_fifo_dst_rdy_i(tx1_dst_rdy),
      .current_seqnum(current_seqnum),
      .debug(debug_vtd) );

   vita_tx_control #(.BASE(BASE), .WIDTH(32*MAXCHAN)) vita_tx_control
     (.clk(clk), .reset(reset), .clear(clear),
      .set_stb(set_stb),.set_addr(set_addr),.set_data(set_data),
      .vita_time(vita_time), .error(error), .ack(ack), .error_code(error_code),
      .sample_fifo_i(tx1_data), .sample_fifo_src_rdy_i(tx1_src_rdy), .sample_fifo_dst_rdy_o(tx1_dst_rdy),
      .sample(sample), .run(run), .strobe(strobe), .packet_consumed(packet_consumed),
      .debug(debug_vtc) );

   wire [35:0] 		flow_data, err_data_int;
   wire 		flow_src_rdy, flow_dst_rdy, err_src_rdy_int, err_dst_rdy_int;
   
   gen_context_pkt #(.PROT_ENG_FLAGS(PROT_ENG_FLAGS),.DSP_NUMBER(DSP_NUMBER)) gen_flow_pkt
     (.clk(clk), .reset(reset), .clear(clear),
      .trigger(trigger & (DO_FLOW_CONTROL==1)), .sent(), 
      .streamid(streamid), .vita_time(vita_time), .message(32'd0),
      .seqnum(current_seqnum),
      .data_o(flow_data), .src_rdy_o(flow_src_rdy), .dst_rdy_i(flow_dst_rdy));
   trigger_context_pkt #(.BASE(BASE)) trigger_context_pkt
     (.clk(clk), .reset(reset), .clear(clear),
      .set_stb(set_stb),.set_addr(set_addr),.set_data(set_data),
      .packet_consumed(packet_consumed), .trigger(trigger));
   
   gen_context_pkt #(.PROT_ENG_FLAGS(PROT_ENG_FLAGS),.DSP_NUMBER(DSP_NUMBER)) gen_tx_err_pkt
     (.clk(clk), .reset(reset), .clear(clear),
      .trigger((error|ack) & (REPORT_ERROR==1)), .sent(), 
      .streamid(streamid), .vita_time(vita_time), .message(message),
      .seqnum(current_seqnum),
      .data_o(err_data_int), .src_rdy_o(err_src_rdy_int), .dst_rdy_i(err_dst_rdy_int));
      
   assign debug = debug_vtc | debug_vtd;
   
   fifo36_mux #(.prio(1)) mux_err_and_flow  // Priority to err messages
     (.clk(clk), .reset(reset), .clear(0),  // Don't clear this or it could get clogged
      .data0_i(err_data_int), .src0_rdy_i(err_src_rdy_int), .dst0_rdy_o(err_dst_rdy_int),
      .data1_i(flow_data), .src1_rdy_i(flow_src_rdy), .dst1_rdy_o(flow_dst_rdy),
      .data_o(err_data_o), .src_rdy_o(err_src_rdy_o), .dst_rdy_i(err_dst_rdy_i));
   
endmodule // vita_tx_chain