pluto_hdl_adi/library/common/ad_jesd_align.v

80 lines
3.0 KiB
Verilog

// ***************************************************************************
// ***************************************************************************
// 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
// freedoms and responsabilities 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 ad_jesd_align (
// jesd interface
input rx_clk,
input [ 3:0] rx_ip_sof,
input [31:0] rx_ip_data,
output reg rx_sof,
output reg [31:0] rx_data);
// internal registers
reg [31:0] rx_ip_data_d = 'd0;
reg [ 3:0] rx_ip_sof_hold = 'd0;
reg rx_ip_sof_d = 'd0;
// dword may contain more than one frame per clock
always @(posedge rx_clk) begin
rx_ip_data_d <= rx_ip_data;
rx_ip_sof_d <= rx_ip_sof;
if (rx_ip_sof != 4'h0) begin
rx_ip_sof_hold <= rx_ip_sof;
end
rx_sof <= |rx_ip_sof_d;
if (rx_ip_sof_hold[0] == 1'b1) begin
rx_data <= rx_ip_data;
end else if (rx_ip_sof_hold[1] == 1'b1) begin
rx_data <= {rx_ip_data[ 7:0], rx_ip_data_d[31: 8]};
end else if (rx_ip_sof_hold[2] == 1'b1) begin
rx_data <= {rx_ip_data[15:0], rx_ip_data_d[31:16]};
end else if (rx_ip_sof_hold[3] == 1'b1) begin
rx_data <= {rx_ip_data[23:0], rx_ip_data_d[31:24]};
end else begin
rx_data <= 32'd0;
end
end
endmodule
// ***************************************************************************
// ***************************************************************************