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//
// Copyright 2016 Ettus Research, a National Instruments Company
//
// SPDX-License-Identifier: LGPL-3.0-or-later
//
module tx_responder
#(parameter BASE = 0)
(input clk, input reset, input clear,
input set_stb, input [7:0] set_addr, input [31:0] set_data,
input ack_or_error, input packet_consumed,
input [11:0] seqnum,
input [63:0] error_code,
input [31:0] sid,
input [63:0] vita_time,
output [63:0] o_tdata, output o_tlast, output o_tvalid, input o_tready);
reg [11:0] seqnum_int;
always @(posedge clk)
if(packet_consumed)
seqnum_int <= seqnum;
wire trigger_fc, trigger_ctxt;
wire [95:0] msg_data = { sid[15:0], sid[31:16], (ack_or_error ? error_code : {32'h0,20'h0,seqnum_int}) };
wire [95:0] ctxt_data;
reg [11:0] reply_seqnum;
wire done;
always @(posedge clk)
if(reset | clear)
reply_seqnum <= 12'd0;
else if(done)
reply_seqnum <= reply_seqnum + 12'd1;
trigger_context_pkt #(.BASE(BASE)) trig
(.clk(clk), .reset(reset), .clear(clear),
.set_stb(set_stb), .set_addr(set_addr), .set_data(set_data),
.packet_consumed(packet_consumed), .trigger(trigger_fc));
axi_fifo_short #(.WIDTH(64+32)) ack_queue
(.clk(clk), .reset(reset), .clear(clear),
.i_tdata(msg_data), .i_tvalid(ack_or_error | trigger_fc), .i_tready(),
.o_tdata(ctxt_data), .o_tvalid(trigger_ctxt), .o_tready(done),
.space(), .occupied());
context_packet_gen ack_err_gen
(.clk(clk), .reset(reset), .clear(clear),
.trigger(trigger_ctxt), .seqnum(reply_seqnum), .sid(ctxt_data[95:64]),
.body(ctxt_data[63:0]), .vita_time(vita_time),
.done(done),
.o_tdata(o_tdata), .o_tlast(o_tlast), .o_tvalid(o_tvalid), .o_tready(o_tready));
endmodule // tx_responder
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