pluto_hdl_adi/library/xilinx/axi_adcfifo/axi_adcfifo_adc.v

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// ***************************************************************************
// ***************************************************************************
// Copyright 2014 - 2017 (c) Analog Devices, Inc. All rights reserved.
//
// Each core or library found in this collection may have its own licensing terms.
// The user should keep this in in mind while exploring these cores.
//
// Redistribution and use in source and binary forms,
// with or without modification of this file, are permitted under the terms of either
// (at the option of the user):
//
// 1. The GNU General Public License version 2 as published by the
// Free Software Foundation, which can be found in the top level directory, or at:
// https://www.gnu.org/licenses/old-licenses/gpl-2.0.en.html
//
// OR
//
// 2. An ADI specific BSD license as noted in the top level directory, or on-line at:
// https://github.com/analogdevicesinc/hdl/blob/dev/LICENSE
//
// ***************************************************************************
// ***************************************************************************
`timescale 1ns/100ps
module axi_adcfifo_adc #(
parameter ADC_DATA_WIDTH = 128,
parameter AXI_DATA_WIDTH = 512) (
// fifo interface
input adc_rst,
input adc_clk,
input adc_wr,
input [ADC_DATA_WIDTH-1:0] adc_wdata,
output reg adc_wovf,
output reg adc_dwr,
output reg [AXI_DATA_WIDTH-1:0] adc_ddata,
// axi interface
input axi_drst,
input axi_clk,
input [ 3:0] axi_xfer_status);
localparam ADC_MEM_RATIO = AXI_DATA_WIDTH/ADC_DATA_WIDTH;
// internal registers
reg [ 2:0] adc_wcnt_int = 'd0;
// internal signals
wire [ 3:0] adc_xfer_status_s;
// write interface: supports only 64, 128, 256 and 512 against 512
always @(posedge adc_clk) begin
if (adc_rst == 1'b1) begin
adc_wovf <= 'd0;
adc_wcnt_int <= 'd0;
adc_dwr <= 'd0;
adc_ddata <= 'd0;
end else begin
adc_wovf <= | adc_xfer_status_s;
adc_dwr <= (ADC_MEM_RATIO == 8) ? adc_wr & adc_wcnt_int[0] & adc_wcnt_int[1] & adc_wcnt_int[2] :
(ADC_MEM_RATIO == 4) ? adc_wr & adc_wcnt_int[0] & adc_wcnt_int[1] :
(ADC_MEM_RATIO == 2) ? adc_wr & adc_wcnt_int[0] :
(ADC_MEM_RATIO == 1) ? adc_wr : 'd0;
if (adc_wr == 1'b1) begin
adc_wcnt_int <= adc_wcnt_int + 1'b1;
case (ADC_MEM_RATIO)
8: begin
adc_ddata[((ADC_DATA_WIDTH*8)-1):(ADC_DATA_WIDTH*7)] <= adc_wdata;
adc_ddata[((ADC_DATA_WIDTH*7)-1):(ADC_DATA_WIDTH*0)] <=
adc_ddata[((ADC_DATA_WIDTH*8)-1):(ADC_DATA_WIDTH*1)];
end
4: begin
adc_ddata[((ADC_DATA_WIDTH*4)-1):(ADC_DATA_WIDTH*3)] <= adc_wdata;
adc_ddata[((ADC_DATA_WIDTH*3)-1):(ADC_DATA_WIDTH*0)] <=
adc_ddata[((ADC_DATA_WIDTH*4)-1):(ADC_DATA_WIDTH*1)];
end
2: begin
adc_ddata[((ADC_DATA_WIDTH*2)-1):(ADC_DATA_WIDTH*1)] <= adc_wdata;
adc_ddata[((ADC_DATA_WIDTH*1)-1):(ADC_DATA_WIDTH*0)] <=
adc_ddata[((ADC_DATA_WIDTH*2)-1):(ADC_DATA_WIDTH*1)];
end
1: begin
adc_ddata <= adc_wdata;
end
default: begin
adc_ddata <= 'd0;
end
endcase
end
end
end
// instantiations
up_xfer_status #(.DATA_WIDTH(4)) i_xfer_status (
.up_rstn (~adc_rst),
.up_clk (adc_clk),
.up_data_status (adc_xfer_status_s),
.d_rst (axi_drst),
.d_clk (axi_clk),
.d_data_status (axi_xfer_status));
endmodule
// ***************************************************************************
// ***************************************************************************