103 lines
3.6 KiB
Verilog
103 lines
3.6 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 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 ad_xcvr_rx_if #(
|
|
parameter OCTETS_PER_BEAT = 4,
|
|
parameter DW = OCTETS_PER_BEAT * 8
|
|
)(
|
|
|
|
// jesd interface
|
|
|
|
input rx_clk,
|
|
input [OCTETS_PER_BEAT-1:0] rx_ip_sof,
|
|
input [DW-1:0] rx_ip_data,
|
|
output reg rx_sof,
|
|
output reg [DW-1:0] rx_data);
|
|
|
|
// rx_ip_sof:
|
|
// The input beat may contain more than one frame per clock, a sof bit is set for
|
|
// each frame.
|
|
// Every bit that corresponds to a octet that is at the beginning of a frame
|
|
// the bit is set. E.g for OCTETS_PER_BEAT = 4
|
|
// if F=1 all bits are set,
|
|
// F=2 sof=4'b0101,
|
|
// F=4 sof=4'b0001
|
|
|
|
//
|
|
// rx_ip_data:
|
|
// The temporal ordering of the octets is from LSB to MSB,
|
|
// this means the octet placed in the lowest 8 bits was received first,
|
|
// the octet placed in the highest 8 bits was received last.
|
|
|
|
// internal registers
|
|
|
|
reg [DW-1:0] rx_ip_data_d = 'd0;
|
|
reg [OCTETS_PER_BEAT-1:0] rx_ip_sof_hold = 'd0;
|
|
reg [OCTETS_PER_BEAT-1:0] rx_ip_sof_d = 'd0;
|
|
|
|
always @(posedge rx_clk) begin
|
|
rx_ip_data_d <= rx_ip_data;
|
|
rx_ip_sof_d <= rx_ip_sof;
|
|
if (|rx_ip_sof) begin
|
|
rx_ip_sof_hold <= rx_ip_sof;
|
|
end
|
|
rx_sof <= |rx_ip_sof_d;
|
|
end
|
|
|
|
wire [OCTETS_PER_BEAT*DW-1:0] rx_data_s;
|
|
assign rx_data_s[0 +: DW] = rx_ip_data;
|
|
generate
|
|
genvar i;
|
|
for (i = 1; i < OCTETS_PER_BEAT; i = i + 1) begin : g_rx_data_opt
|
|
assign rx_data_s[i*DW +: DW] = {rx_ip_data[i*8-1 : 0], rx_ip_data_d[DW-1 : i*8]};
|
|
end
|
|
endgenerate
|
|
|
|
integer j;
|
|
always @(posedge rx_clk) begin
|
|
for (j = OCTETS_PER_BEAT-1; j >= 0; j = j - 1) begin
|
|
if (rx_ip_sof_hold[j] == 1'b1) begin
|
|
rx_data <= rx_data_s[j*DW +: DW];
|
|
end
|
|
end
|
|
end
|
|
|
|
endmodule
|
|
|
|
// ***************************************************************************
|
|
// ***************************************************************************
|