pluto_hdl_adi/library/common/ad_xcvr_rx_if.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_xcvr_rx_if #(
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parameter DEVICE_TYPE = 0) (
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// 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);
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// internal registers
reg [31:0] rx_ip_data_d = 'd0;
reg [ 3:0] rx_ip_sof_hold = 'd0;
reg rx_ip_sof_d = 'd0;
// internal signals
wire [ 3:0] rx_ip_sof_s;
wire [31:0] rx_ip_data_s;
// altera/xilinx
generate
if (DEVICE_TYPE == 1) begin
assign rx_ip_sof_s[3] = rx_ip_sof[0];
assign rx_ip_sof_s[2] = rx_ip_sof[1];
assign rx_ip_sof_s[1] = rx_ip_sof[2];
assign rx_ip_sof_s[0] = rx_ip_sof[3];
assign rx_ip_data_s[31:24] = rx_ip_data[ 7: 0];
assign rx_ip_data_s[23:16] = rx_ip_data[15: 8];
assign rx_ip_data_s[15: 8] = rx_ip_data[23:16];
assign rx_ip_data_s[ 7: 0] = rx_ip_data[31:24];
end else begin
assign rx_ip_sof_s[3] = rx_ip_sof[3];
assign rx_ip_sof_s[2] = rx_ip_sof[2];
assign rx_ip_sof_s[1] = rx_ip_sof[1];
assign rx_ip_sof_s[0] = rx_ip_sof[0];
assign rx_ip_data_s[31:24] = rx_ip_data[31:24];
assign rx_ip_data_s[23:16] = rx_ip_data[23:16];
assign rx_ip_data_s[15: 8] = rx_ip_data[15: 8];
assign rx_ip_data_s[ 7: 0] = rx_ip_data[ 7: 0];
end
endgenerate
// dword may contain more than one frame per clock
always @(posedge rx_clk) begin
rx_ip_data_d <= rx_ip_data_s;
rx_ip_sof_d <= rx_ip_sof_s;
if (rx_ip_sof_s != 4'h0) begin
rx_ip_sof_hold <= rx_ip_sof_s;
end
rx_sof <= |rx_ip_sof_d;
if (rx_ip_sof_hold[0] == 1'b1) begin
rx_data <= rx_ip_data_s;
end else if (rx_ip_sof_hold[1] == 1'b1) begin
rx_data <= {rx_ip_data_s[ 7:0], rx_ip_data_d[31: 8]};
end else if (rx_ip_sof_hold[2] == 1'b1) begin
rx_data <= {rx_ip_data_s[15:0], rx_ip_data_d[31:16]};
end else if (rx_ip_sof_hold[3] == 1'b1) begin
rx_data <= {rx_ip_data_s[23:0], rx_ip_data_d[31:24]};
end else begin
rx_data <= 32'd0;
end
end
endmodule
// ***************************************************************************
// ***************************************************************************