pluto_hdl_adi/library/axi_dmac/response_generator.v

78 lines
2.3 KiB
Verilog

// ***************************************************************************
// ***************************************************************************
// Copyright 2014 - 2017 (c) Analog Devices, Inc. All rights reserved.
//
// This core 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.
//
// Redistribution and use of source or resulting binaries, with or without modification
// of this file, are permitted under one of the following two license terms:
//
// 1. The GNU General Public License version 2 as published by the
// Free Software Foundation, which can be found in the top level directory of
// the repository (LICENSE_GPL2), and at: <https://www.gnu.org/licenses/old-licenses/gpl-2.0.html>
//
// OR
//
// 2. An ADI specific BSD license as noted in the top level directory, or on-line at:
// https://github.com/analogdevicesinc/hdl/blob/master/LICENSE_ADIBSD
// This will allow to generate bit files and not release the source code,
// as long as it attaches to an ADI device.
//
// ***************************************************************************
// ***************************************************************************
module dmac_response_generator (
input clk,
input resetn,
input enable,
output reg enabled,
input [ID_WIDTH-1:0] request_id,
output reg [ID_WIDTH-1:0] response_id,
input sync_id,
input eot,
output resp_valid,
input resp_ready,
output resp_eot,
output [1:0] resp_resp
);
parameter ID_WIDTH = 3;
`include "inc_id.h"
`include "resp.h"
assign resp_resp = RESP_OKAY;
assign resp_eot = eot;
assign resp_valid = request_id != response_id && enabled;
// We have to wait for all responses before we can disable the response handler
always @(posedge clk) begin
if (resetn == 1'b0) begin
enabled <= 1'b0;
end else begin
if (enable)
enabled <= 1'b1;
else if (request_id == response_id)
enabled <= 1'b0;
end
end
always @(posedge clk) begin
if (resetn == 1'b0) begin
response_id <= 'h0;
end else begin
if ((resp_valid && resp_ready) ||
(sync_id && response_id != request_id))
response_id <= inc_id(response_id);
end
end
endmodule