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pluto_hdl_adi/library/xilinx/axi_dacfifo/axi_dacfifo.v

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// ***************************************************************************
// ***************************************************************************
// 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 responsabilities 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 axi_dacfifo #(
parameter DAC_DATA_WIDTH = 64,
parameter DMA_DATA_WIDTH = 64,
parameter AXI_DATA_WIDTH = 512,
parameter AXI_SIZE = 2,
parameter AXI_LENGTH = 15,
parameter AXI_ADDRESS = 32'h00000000,
parameter AXI_ADDRESS_LIMIT = 32'hffffffff) (
// dma interface (AXI Stream)
input dma_clk,
input dma_rst,
input dma_valid,
input [(DMA_DATA_WIDTH-1):0] dma_data,
output reg dma_ready,
input dma_xfer_req,
input dma_xfer_last,
// dac interface
input dac_clk,
input dac_rst,
input dac_valid,
output reg [(DAC_DATA_WIDTH-1):0] dac_data,
output reg dac_dunf,
output reg dac_xfer_out,
input bypass,
// axi interface
input axi_clk,
input axi_resetn,
output axi_awvalid,
output [ 3:0] axi_awid,
output [ 1:0] axi_awburst,
output axi_awlock,
output [ 3:0] axi_awcache,
output [ 2:0] axi_awprot,
output [ 3:0] axi_awqos,
output [ 3:0] axi_awuser,
output [ 7:0] axi_awlen,
output [ 2:0] axi_awsize,
output [ 31:0] axi_awaddr,
input axi_awready,
output axi_wvalid,
output [(AXI_DATA_WIDTH-1):0] axi_wdata,
output [(AXI_DATA_WIDTH/8-1):0] axi_wstrb,
output axi_wlast,
output [ 3:0] axi_wuser,
input axi_wready,
input axi_bvalid,
input [ 3:0] axi_bid,
input [ 1:0] axi_bresp,
input [ 3:0] axi_buser,
output axi_bready,
output axi_arvalid,
output [ 3:0] axi_arid,
output [ 1:0] axi_arburst,
output axi_arlock,
output [ 3:0] axi_arcache,
output [ 2:0] axi_arprot,
output [ 3:0] axi_arqos,
output [ 3:0] axi_aruser,
output [ 7:0] axi_arlen,
output [ 2:0] axi_arsize,
output [ 31:0] axi_araddr,
input axi_arready,
input axi_rvalid,
input [ 3:0] axi_rid,
input [ 3:0] axi_ruser,
input [ 1:0] axi_rresp,
input axi_rlast,
input [(AXI_DATA_WIDTH-1):0] axi_rdata,
output axi_rready);
localparam FIFO_BYPASS = (DAC_DATA_WIDTH == DMA_DATA_WIDTH) ? 1 : 0;
reg dma_bypass_m1 = 1'b0;
reg dma_bypass = 1'b0;
reg dac_bypass_m1 = 1'b0;
reg dac_bypass = 1'b0;
reg dac_xfer_out_m1 = 1'b0;
reg dac_xfer_out_bypass = 1'b0;
// internal signals
wire [(AXI_DATA_WIDTH-1):0] axi_rd_data_s;
wire axi_rd_ready_s;
wire axi_rd_valid_s;
wire axi_xfer_req_s;
wire [31:0] axi_last_addr_s;
wire [ 3:0] axi_last_beats_s;
wire axi_dlast_s;
wire [ 3:0] dma_last_beats_s;
wire [(DAC_DATA_WIDTH-1):0] dac_data_fifo_s;
wire [(DAC_DATA_WIDTH-1):0] dac_data_bypass_s;
wire dac_xfer_fifo_out_s;
wire dac_dunf_fifo_s;
wire dac_dunf_bypass_s;
wire dma_ready_wr_s;
axi_dacfifo_wr #(
.AXI_DATA_WIDTH (AXI_DATA_WIDTH),
.DMA_DATA_WIDTH (DMA_DATA_WIDTH),
.AXI_SIZE (AXI_SIZE),
.AXI_LENGTH (AXI_LENGTH),
.AXI_ADDRESS (AXI_ADDRESS),
.AXI_ADDRESS_LIMIT (AXI_ADDRESS_LIMIT)
) i_wr (
.dma_clk (dma_clk),
.dma_data (dma_data),
.dma_ready (dma_ready),
.dma_ready_out (dma_ready_wr_s),
.dma_valid (dma_valid),
.dma_xfer_req (dma_xfer_req),
.dma_xfer_last (dma_xfer_last),
.dma_last_beats (dma_last_beats_s),
.axi_last_addr (axi_last_addr_s),
.axi_last_beats (axi_last_beats_s),
.axi_xfer_out (axi_xfer_req_s),
.axi_clk (axi_clk),
.axi_resetn (axi_resetn),
.axi_awvalid (axi_awvalid),
.axi_awid (axi_awid),
.axi_awburst (axi_awburst),
.axi_awlock (axi_awlock),
.axi_awcache (axi_awcache),
.axi_awprot (axi_awprot),
.axi_awqos (axi_awqos),
.axi_awuser (axi_awuser),
.axi_awlen (axi_awlen),
.axi_awsize (axi_awsize),
.axi_awaddr (axi_awaddr),
.axi_awready (axi_awready),
.axi_wvalid (axi_wvalid),
.axi_wdata (axi_wdata),
.axi_wstrb (axi_wstrb),
.axi_wlast (axi_wlast),
.axi_wuser (axi_wuser),
.axi_wready (axi_wready),
.axi_bvalid (axi_bvalid),
.axi_bid (axi_bid),
.axi_bresp (axi_bresp),
.axi_buser (axi_buser),
.axi_bready (axi_bready),
.axi_werror (axi_werror));
axi_dacfifo_rd #(
.AXI_DATA_WIDTH (AXI_DATA_WIDTH),
.AXI_SIZE (AXI_SIZE),
.AXI_LENGTH (AXI_LENGTH),
.AXI_ADDRESS (AXI_ADDRESS)
) i_rd (
.axi_xfer_req (axi_xfer_req_s),
.axi_last_raddr (axi_last_addr_s),
.axi_last_beats (axi_last_beats_s),
.axi_clk (axi_clk),
.axi_resetn (axi_resetn),
.axi_arvalid (axi_arvalid),
.axi_arid (axi_arid),
.axi_arburst (axi_arburst),
.axi_arlock (axi_arlock),
.axi_arcache (axi_arcache),
.axi_arprot (axi_arprot),
.axi_arqos (axi_arqos),
.axi_aruser (axi_aruser),
.axi_arlen (axi_arlen),
.axi_arsize (axi_arsize),
.axi_araddr (axi_araddr),
.axi_arready (axi_arready),
.axi_rvalid (axi_rvalid),
.axi_rid (axi_rid),
.axi_ruser (axi_ruser),
.axi_rresp (axi_rresp),
.axi_rlast (axi_rlast),
.axi_rdata (axi_rdata),
.axi_rready (axi_rready),
.axi_rerror (axi_rerror),
.axi_dvalid (axi_rd_valid_s),
.axi_ddata (axi_rd_data_s),
.axi_dready (axi_rd_ready_s),
.axi_dlast (axi_dlast_s));
axi_dacfifo_dac #(
.AXI_DATA_WIDTH (AXI_DATA_WIDTH),
.AXI_LENGTH(AXI_LENGTH),
.DAC_DATA_WIDTH (DAC_DATA_WIDTH)
) i_dac (
.axi_clk (axi_clk),
.axi_dvalid (axi_rd_valid_s),
.axi_ddata (axi_rd_data_s),
.axi_dready (axi_rd_ready_s),
.axi_dlast (axi_dlast_s),
.axi_xfer_req (axi_xfer_req_s),
.dma_last_beats (dma_last_beats_s),
.dac_clk (dac_clk),
.dac_rst (dac_rst),
.dac_valid (dac_valid),
.dac_data (dac_data_fifo_s),
.dac_xfer_out (dac_xfer_fifo_out_s),
.dac_dunf (dac_dunf_fifo_s));
// bypass logic -- supported if DAC_DATA_WIDTH == DMA_DATA_WIDTH
generate
if (FIFO_BYPASS) begin
util_dacfifo_bypass #(
.DAC_DATA_WIDTH (DAC_DATA_WIDTH),
.DMA_DATA_WIDTH (DMA_DATA_WIDTH)
) i_dacfifo_bypass (
.dma_clk(dma_clk),
.dma_data(dma_data),
.dma_ready(dma_ready),
.dma_ready_out(dma_ready_bypass_s),
.dma_valid(dma_valid),
.dma_xfer_req(dma_xfer_req),
.dac_clk(dac_clk),
.dac_rst(dac_rst),
.dac_valid(dac_valid),
.dac_data(dac_data_bypass_s),
.dac_dunf(dac_dunf_bypass_s)
);
always @(posedge dma_clk) begin
dma_bypass_m1 <= bypass;
dma_bypass <= dma_bypass_m1;
end
always @(posedge dac_clk) begin
dac_bypass_m1 <= bypass;
dac_bypass <= dac_bypass_m1;
dac_xfer_out_m1 <= dma_xfer_req;
dac_xfer_out_bypass <= dac_xfer_out_m1;
end
// mux for the dma_ready
always @(posedge dma_clk) begin
dma_ready <= (dma_bypass) ? dma_ready_bypass_s : dma_ready_wr_s;
end
// mux for dac data
always @(posedge dac_clk) begin
if (dac_valid) begin
dac_data <= (dac_bypass) ? dac_data_bypass_s : dac_data_fifo_s;
end
dac_xfer_out <= (dac_bypass) ? dac_xfer_out_bypass : dac_xfer_fifo_out_s;
dac_dunf <= (dac_bypass) ? dac_dunf_bypass_s : dac_dunf_fifo_s;
end
end else begin /* if (~FIFO_BYPASS) */
always @(posedge dma_clk) begin
dma_ready <= dma_ready_wr_s;
end
always @(posedge dac_clk) begin
if (dac_valid) begin
dac_data <= dac_data_fifo_s;
end
dac_xfer_out <= dac_xfer_fifo_out_s;
dac_dunf <= dac_dunf_fifo_s;
end
end
endgenerate
endmodule
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