246 lines
8.4 KiB
Verilog
246 lines
8.4 KiB
Verilog
// ***************************************************************************
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// ***************************************************************************
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// Copyright 2011(c) Analog Devices, Inc.
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//
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// All rights reserved.
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//
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// Redistribution and use in source and binary forms, with or without modification,
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// are permitted provided that the following conditions are met:
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// - Redistributions of source code must retain the above copyright
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// notice, this list of conditions and the following disclaimer.
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// - Redistributions in binary form must reproduce the above copyright
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// notice, this list of conditions and the following disclaimer in
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// the documentation and/or other materials provided with the
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// distribution.
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// - Neither the name of Analog Devices, Inc. nor the names of its
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// contributors may be used to endorse or promote products derived
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// from this software without specific prior written permission.
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// - The use of this software may or may not infringe the patent rights
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// of one or more patent holders. This license does not release you
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// from the requirement that you obtain separate licenses from these
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// patent holders to use this software.
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// - Use of the software either in source or binary form, must be run
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// on or directly connected to an Analog Devices Inc. component.
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//
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// THIS SOFTWARE IS PROVIDED BY ANALOG DEVICES "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES,
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// INCLUDING, BUT NOT LIMITED TO, NON-INFRINGEMENT, MERCHANTABILITY AND FITNESS FOR A
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// PARTICULAR PURPOSE ARE DISCLAIMED.
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//
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// IN NO EVENT SHALL ANALOG DEVICES BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL,
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// EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, INTELLECTUAL PROPERTY
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// RIGHTS, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR
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// BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT,
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// STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF
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// THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
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// ***************************************************************************
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// ***************************************************************************
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// ***************************************************************************
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// ***************************************************************************
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`timescale 1ns/100ps
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module util_adcfifo (
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// fifo interface
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adc_rst,
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adc_clk,
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adc_wr,
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adc_wdata,
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adc_wovf,
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// dma interface
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dma_clk,
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dma_wr,
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dma_wdata,
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dma_wready,
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dma_xfer_req,
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dma_xfer_status);
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// parameters
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parameter ADC_DATA_WIDTH = 256;
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parameter DMA_DATA_WIDTH = 64;
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parameter DMA_READY_ENABLE = 1;
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parameter DMA_ADDR_WIDTH = 10;
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localparam DMA_MEM_RATIO = ADC_DATA_WIDTH/DMA_DATA_WIDTH;
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localparam ADC_ADDR_WIDTH = (DMA_MEM_RATIO == 2) ? (DMA_ADDR_WIDTH - 1) :
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((DMA_MEM_RATIO == 4) ? (DMA_ADDR_WIDTH - 2) : (DMA_ADDR_WIDTH - 3));
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localparam ADC_ADDR_LIMIT = (2**ADC_ADDR_WIDTH)-1;
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// adc interface
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input adc_rst;
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input adc_clk;
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input adc_wr;
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input [ADC_DATA_WIDTH-1:0] adc_wdata;
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output adc_wovf;
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// dma interface
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input dma_clk;
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output dma_wr;
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output [DMA_DATA_WIDTH-1:0] dma_wdata;
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input dma_wready;
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input dma_xfer_req;
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output [ 3:0] dma_xfer_status;
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// internal registers
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reg [ 2:0] adc_xfer_req_m = 'd0;
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reg adc_xfer_init = 'd0;
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reg adc_xfer_enable = 'd0;
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reg adc_wr_int = 'd0;
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reg [ADC_DATA_WIDTH-1:0] adc_wdata_int = 'd0;
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reg [ADC_ADDR_WIDTH-1:0] adc_waddr_int = 'd0;
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reg adc_waddr_rel_t = 'd0;
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reg [ADC_ADDR_WIDTH-1:0] adc_waddr_rel = 'd0;
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reg dma_rst = 'd0;
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reg [ 2:0] dma_waddr_rel_t_m = 'd0;
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reg [ADC_ADDR_WIDTH-1:0] dma_waddr_rel = 'd0;
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reg dma_rd = 'd0;
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reg dma_rd_d = 'd0;
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reg [DMA_DATA_WIDTH-1:0] dma_rdata_d = 'd0;
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reg [DMA_ADDR_WIDTH-1:0] dma_raddr = 'd0;
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// internal signals
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wire dma_waddr_rel_t_s;
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wire [DMA_ADDR_WIDTH-1:0] dma_waddr_rel_s;
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wire dma_wready_s;
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wire dma_rd_s;
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wire [DMA_DATA_WIDTH-1:0] dma_rdata_s;
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// write interface
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assign adc_wovf = 1'd0;
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always @(posedge adc_clk or posedge adc_rst) begin
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if (adc_rst == 1'b1) begin
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adc_xfer_req_m <= 'd0;
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adc_xfer_init <= 'd0;
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adc_xfer_enable <= 'd0;
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end else begin
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adc_xfer_req_m <= {adc_xfer_req_m[1:0], dma_xfer_req};
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adc_xfer_init <= adc_xfer_req_m[1] & ~adc_xfer_req_m[2];
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if (adc_xfer_init == 1'b1) begin
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adc_xfer_enable <= 1'b1;
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end else if ((adc_waddr_int >= ADC_ADDR_LIMIT) ||
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(adc_xfer_req_m[2] == 1'b0)) begin
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adc_xfer_enable <= 1'b0;
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end
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end
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end
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always @(posedge adc_clk or posedge adc_rst) begin
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if (adc_rst == 1'b1) begin
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adc_wr_int <= 'd0;
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adc_wdata_int <= 'd0;
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adc_waddr_int <= 'd0;
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end else begin
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if (adc_xfer_init == 1'b1) begin
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adc_wr_int <= 'd0;
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adc_wdata_int <= 'd0;
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adc_waddr_int <= 'd0;
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end else begin
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adc_wr_int <= adc_wr & adc_xfer_enable;
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adc_wdata_int <= adc_wdata;
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if (adc_wr_int == 1'b1) begin
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adc_waddr_int <= adc_waddr_int + 1'b1;
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end
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end
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end
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end
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always @(posedge adc_clk or posedge adc_rst) begin
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if (adc_rst == 1'b1) begin
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adc_waddr_rel_t <= 'd0;
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adc_waddr_rel <= 'd0;
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end else begin
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if ((adc_wr_int == 1'b1) && (adc_waddr_int[2:0] == 3'd7)) begin
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adc_waddr_rel_t <= ~adc_waddr_rel_t;
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adc_waddr_rel <= adc_waddr_int;
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end
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end
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end
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// read interface
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assign dma_xfer_status = 4'd0;
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assign dma_waddr_rel_t_s = dma_waddr_rel_t_m[2] ^ dma_waddr_rel_t_m[1];
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assign dma_waddr_rel_s = (DMA_MEM_RATIO == 2) ? {dma_waddr_rel, 1'd0} :
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((DMA_MEM_RATIO == 4) ? {dma_waddr_rel, 2'd0} : {dma_waddr_rel, 3'd0});
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always @(posedge dma_clk) begin
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if (dma_xfer_req == 1'b0) begin
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dma_rst <= 1'b1;
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dma_waddr_rel_t_m <= 'd0;
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dma_waddr_rel <= 'd0;
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end else begin
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dma_rst <= 1'b0;
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dma_waddr_rel_t_m <= {dma_waddr_rel_t_m[1:0], adc_waddr_rel_t};
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if (dma_waddr_rel_t_s == 1'b1) begin
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dma_waddr_rel <= adc_waddr_rel;
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end
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end
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end
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always @(posedge dma_clk) begin
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if (dma_xfer_req == 1'b0) begin
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end else begin
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end
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end
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assign dma_wready_s = (DMA_READY_ENABLE == 0) ? 1'b1 : dma_wready;
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assign dma_rd_s = (dma_raddr >= dma_waddr_rel_s) ? 1'b0 : dma_wready_s;
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always @(posedge dma_clk) begin
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if (dma_xfer_req == 1'b0) begin
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dma_rd <= 'd0;
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dma_rd_d <= 'd0;
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dma_rdata_d <= 'd0;
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dma_raddr <= 'd0;
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end else begin
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dma_rd <= dma_rd_s;
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dma_rd_d <= dma_rd;
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dma_rdata_d <= dma_rdata_s;
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if (dma_rd_s == 1'b1) begin
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dma_raddr <= dma_raddr + 1'b1;
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end
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end
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end
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// instantiations
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ad_mem_asym #(
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.ADDR_WIDTH_A (ADC_ADDR_WIDTH),
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.DATA_WIDTH_A (ADC_DATA_WIDTH),
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.ADDR_WIDTH_B (DMA_ADDR_WIDTH),
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.DATA_WIDTH_B (DMA_DATA_WIDTH))
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i_mem_asym (
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.clka (adc_clk),
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.wea (adc_wr_int),
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.addra (adc_waddr_int),
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.dina (adc_wdata_int),
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.clkb (dma_clk),
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.addrb (dma_raddr),
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.doutb (dma_rdata_s));
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ad_axis_inf_rx #(.DATA_WIDTH(DMA_DATA_WIDTH)) i_axis_inf (
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.clk (dma_clk),
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.rst (dma_rst),
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.valid (dma_rd_d),
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.last (1'd0),
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.data (dma_rdata_d),
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.inf_valid (dma_wr),
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.inf_last (),
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.inf_data (dma_wdata),
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.inf_ready (dma_wready));
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endmodule
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// ***************************************************************************
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// ***************************************************************************
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