pluto_hdl_adi/library/common/altera/ad_jesd_align.v

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// ***************************************************************************
// ***************************************************************************
// Copyright 2011(c) Analog Devices, Inc.
//
// All rights reserved.
//
// Redistribution and use in source and binary forms, with or without modification,
// are permitted provided that the following conditions are met:
// - Redistributions of source code must retain the above copyright
// notice, this list of conditions and the following disclaimer.
// - Redistributions in binary form must reproduce the above copyright
// notice, this list of conditions and the following disclaimer in
// the documentation and/or other materials provided with the
// distribution.
// - Neither the name of Analog Devices, Inc. nor the names of its
// contributors may be used to endorse or promote products derived
// from this software without specific prior written permission.
// - The use of this software may or may not infringe the patent rights
// of one or more patent holders. This license does not release you
// from the requirement that you obtain separate licenses from these
// patent holders to use this software.
// - Use of the software either in source or binary form, must be run
// on or directly connected to an Analog Devices Inc. component.
//
// THIS SOFTWARE IS PROVIDED BY ANALOG DEVICES "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES,
// INCLUDING, BUT NOT LIMITED TO, NON-INFRINGEMENT, MERCHANTABILITY AND FITNESS FOR A
// PARTICULAR PURPOSE ARE DISCLAIMED.
//
// IN NO EVENT SHALL ANALOG DEVICES BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL,
// EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, INTELLECTUAL PROPERTY
// RIGHTS, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR
// BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT,
// STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF
// THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
// ***************************************************************************
// ***************************************************************************
`timescale 1ns/100ps
module ad_jesd_align (
// jesd interface
rx_clk,
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rx_ip_sof,
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rx_ip_data,
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rx_sof,
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rx_data);
// jesd interface
input rx_clk;
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input [ 3:0] rx_ip_sof;
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input [31:0] rx_ip_data;
// aligned data
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output rx_sof;
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output [31:0] rx_data;
// internal registers
reg [31:0] rx_ip_data_d = 'd0;
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reg [ 3:0] rx_ip_sof_hold = 'd0;
reg rx_sof = 'd0;
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reg [31:0] rx_data = 'd0;
// dword may contain more than one frame per clock
always @(posedge rx_clk) begin
rx_ip_data_d <= rx_ip_data;
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if (rx_ip_sof != 4'd0) begin
rx_ip_sof_hold <= rx_ip_sof;
end
rx_sof <= |rx_ip_sof;
if (rx_ip_sof_hold[3] == 1'b1) begin
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rx_data[31:24] <= rx_ip_data[ 7: 0];
rx_data[23:16] <= rx_ip_data[15: 8];
rx_data[15: 8] <= rx_ip_data[23:16];
rx_data[ 7: 0] <= rx_ip_data[31:24];
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end else if (rx_ip_sof_hold[2] == 1'b1) begin
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rx_data[31:24] <= rx_ip_data[31:24];
rx_data[23:16] <= rx_ip_data_d[ 7: 0];
rx_data[15: 8] <= rx_ip_data_d[15: 8];
rx_data[ 7: 0] <= rx_ip_data_d[23:16];
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end else if (rx_ip_sof_hold[1] == 1'b1) begin
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rx_data[31:24] <= rx_ip_data[23:16];
rx_data[23:16] <= rx_ip_data[31:24];
rx_data[15: 8] <= rx_ip_data_d[ 7: 0];
rx_data[ 7: 0] <= rx_ip_data_d[15: 8];
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end else if (rx_ip_sof_hold[0] == 1'b1) begin
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rx_data[31:24] <= rx_ip_data[15: 8];
rx_data[23:16] <= rx_ip_data[23:16];
rx_data[15: 8] <= rx_ip_data[31:24];
rx_data[ 7: 0] <= rx_ip_data_d[ 7: 0];
end else begin
rx_data[31:24] <= 8'd0;
rx_data[23:16] <= 8'd0;
rx_data[15: 8] <= 8'd0;
rx_data[ 7: 0] <= 8'd0;
end
end
endmodule
// ***************************************************************************
// ***************************************************************************