pluto_hdl_adi/library/axi_ad7616/axi_ad7616_maxis2wrfifo.v

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// ***************************************************************************
// ***************************************************************************
// Copyright 2014 - 2017 (c) Analog Devices, Inc. All rights reserved.
//
// In this HDL repository, there are many different and unique modules, consisting
// of various HDL (Verilog or VHDL) components. The individual modules are
// developed independently, and may be accompanied by separate and unique license
// terms.
//
// The user should read each of these license terms, and understand the
2018-03-14 14:45:47 +00:00
// freedoms and responsibilities that he or she has by using this source/core.
//
// 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 this repository (LICENSE_GPL2), and also online at:
// <https://www.gnu.org/licenses/old-licenses/gpl-2.0.html>
//
// OR
//
// 2. An ADI specific BSD license, which can be found in the top level directory
// of this repository (LICENSE_ADIBSD), and also 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.
//
// ***************************************************************************
// ***************************************************************************
`timescale 1ns/100ps
module axi_ad7616_maxis2wrfifo #(
parameter DATA_WIDTH = 16
) (
input clk,
input rstn,
input sync_in,
// m_axis interface
input [DATA_WIDTH-1:0] m_axis_data,
output reg m_axis_ready,
input m_axis_valid,
output reg m_axis_xfer_req,
// write fifo interface
output reg fifo_wr_en,
output reg [DATA_WIDTH-1:0] fifo_wr_data,
output reg fifo_wr_sync,
input fifo_wr_xfer_req
);
always @(posedge clk) begin
if (rstn == 1'b0) begin
m_axis_ready <= 1'b0;
m_axis_xfer_req <= 1'b0;
fifo_wr_data <= 'b0;
fifo_wr_en <= 1'b0;
fifo_wr_sync <= 1'b0;
end else begin
m_axis_ready <= 1'b1;
m_axis_xfer_req <= fifo_wr_xfer_req;
fifo_wr_data <= m_axis_data;
fifo_wr_en <= m_axis_valid;
if (sync_in == 1'b1) begin
fifo_wr_sync <= 1'b1;
end else if ((m_axis_valid == 1'b1) &&
(fifo_wr_sync == 1'b1)) begin
fifo_wr_sync <= 1'b0;
end
end
end
endmodule