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pluto_hdl_adi/library/altera/avl_dacfifo/avl_dacfifo_rd.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 avl_dacfifo_rd #(
parameter AVL_DATA_WIDTH = 512,
parameter DAC_DATA_WIDTH = 64,
parameter AVL_DDR_BASE_ADDRESS = 0,
parameter AVL_DDR_ADDRESS_LIMIT = 1048576,
parameter DAC_MEM_ADDRESS_WIDTH = 8)(
input dac_clk,
input dac_reset,
input dac_valid,
output reg [(DAC_DATA_WIDTH-1):0] dac_data,
output reg dac_xfer_req,
output reg dac_dunf,
input avl_clk,
input avl_reset,
output reg [24:0] avl_address,
output reg [ 5:0] avl_burstcount,
output reg [63:0] avl_byteenable,
input avl_ready,
input avl_readdatavalid,
output reg avl_read,
input [AVL_DATA_WIDTH-1:0] avl_data,
input [24:0] avl_last_address,
input [63:0] avl_last_byteenable,
input avl_xfer_req);
// Max supported MEM_RATIO is 16
localparam MEM_RATIO = AVL_DATA_WIDTH/DAC_DATA_WIDTH;
localparam AVL_MEM_ADDRESS_WIDTH = (MEM_RATIO == 1) ? DAC_MEM_ADDRESS_WIDTH :
(MEM_RATIO == 2) ? (DAC_MEM_ADDRESS_WIDTH - 1) :
(MEM_RATIO == 4) ? (DAC_MEM_ADDRESS_WIDTH - 2) :
(MEM_RATIO == 8) ? (DAC_MEM_ADDRESS_WIDTH - 3) :
(MEM_RATIO == 16) ? (DAC_MEM_ADDRESS_WIDTH - 4) :
(DAC_MEM_ADDRESS_WIDTH - 5);
localparam AVL_MEM_THRESHOLD_LO = 8;
localparam AVL_MEM_THRESHOLD_HI = {(AVL_MEM_ADDRESS_WIDTH){1'b1}} - 7;
localparam MEM_WIDTH_DIFF = (MEM_RATIO > 16) ? 5 :
(MEM_RATIO > 8) ? 4 :
(MEM_RATIO > 4) ? 3 :
(MEM_RATIO > 2) ? 2 :
(MEM_RATIO > 1) ? 1 : 1;
// internal register
reg [AVL_MEM_ADDRESS_WIDTH-1:0] avl_mem_wr_address;
reg [AVL_MEM_ADDRESS_WIDTH-1:0] avl_mem_wr_address_g;
reg [DAC_MEM_ADDRESS_WIDTH-1:0] avl_mem_rd_address;
reg [DAC_MEM_ADDRESS_WIDTH-1:0] avl_mem_rd_address_m1;
reg [DAC_MEM_ADDRESS_WIDTH-1:0] avl_mem_rd_address_m2;
reg avl_mem_wr_enable;
reg avl_mem_request_data;
reg [AVL_DATA_WIDTH-1:0] avl_mem_data;
reg [AVL_MEM_ADDRESS_WIDTH-1:0] avl_mem_address_diff;
reg avl_read_inprogress;
reg avl_last_transfer;
reg [AVL_MEM_ADDRESS_WIDTH-1:0] dac_mem_wr_address;
reg [AVL_MEM_ADDRESS_WIDTH-1:0] dac_mem_wr_address_m1;
reg [AVL_MEM_ADDRESS_WIDTH-1:0] dac_mem_wr_address_m2;
reg [DAC_MEM_ADDRESS_WIDTH-1:0] dac_mem_wr_last_address;
reg [DAC_MEM_ADDRESS_WIDTH-1:0] dac_mem_rd_address;
reg [DAC_MEM_ADDRESS_WIDTH-1:0] dac_mem_rd_address_g;
reg [DAC_MEM_ADDRESS_WIDTH-1:0] dac_mem_address_diff;
reg [DAC_MEM_ADDRESS_WIDTH-1:0] dac_mem_rd_last_address;
reg dac_mem_last_transfer_active;
reg dac_avl_xfer_req;
reg dac_avl_xfer_req_m1;
reg dac_avl_xfer_req_m2;
reg dac_avl_last_transfer_m1;
reg dac_avl_last_transfer_m2;
reg dac_avl_last_transfer;
// internal signals
wire [AVL_MEM_ADDRESS_WIDTH-1:0] avl_mem_rd_address_s;
wire [AVL_MEM_ADDRESS_WIDTH:0] avl_mem_address_diff_s;
wire [AVL_MEM_ADDRESS_WIDTH:0] avl_mem_wr_address_b2g_s;
wire [DAC_MEM_ADDRESS_WIDTH:0] dac_mem_address_diff_s;
wire [DAC_MEM_ADDRESS_WIDTH:0] dac_mem_wr_address_s;
wire [AVL_MEM_ADDRESS_WIDTH-1:0] dac_mem_wr_address_g2b_s;
wire [DAC_MEM_ADDRESS_WIDTH-1:0] avl_mem_rd_address_g2b_s;
wire [DAC_MEM_ADDRESS_WIDTH-1:0] dac_mem_rd_address_b2g_s;
wire dac_mem_rd_enable_s;
wire [DAC_DATA_WIDTH-1:0] dac_mem_data_s;
wire [MEM_WIDTH_DIFF-1:0] avl_last_beats_s;
wire avl_last_transfer_s;
// ==========================================================================
// An asymmetric memory to transfer data from Avalon interface to DAC
// interface
// ==========================================================================
ad_mem_asym #(
.A_ADDRESS_WIDTH (AVL_MEM_ADDRESS_WIDTH),
.A_DATA_WIDTH (AVL_DATA_WIDTH),
.B_ADDRESS_WIDTH (DAC_MEM_ADDRESS_WIDTH),
.B_DATA_WIDTH (DAC_DATA_WIDTH))
i_mem_asym (
.clka (avl_clk),
.wea (avl_mem_wr_enable),
.addra (avl_mem_wr_address),
.dina (avl_mem_data),
.clkb (dac_clk),
.addrb (dac_mem_rd_address),
.doutb (dac_mem_data_s));
// ==========================================================================
// Avalon Memory Mapped interface access
// ==========================================================================
// Avalon address generation and read control signaling
always @(posedge avl_clk) begin
if ((avl_reset == 1'b1) || (avl_xfer_req == 1'b0)) begin
avl_address <= AVL_DDR_BASE_ADDRESS;
end else begin
if (avl_readdatavalid == 1'b1) begin
avl_address <= (avl_address < avl_last_address) ? avl_address + 1 : 0;
end
end
end
assign avl_read_en_s = avl_xfer_req & avl_mem_request_data;
always @(posedge avl_clk) begin
if (avl_reset == 1'b1) begin
avl_read <= 1'b0;
avl_read_inprogress <= 1'b0;
end else begin
if ((avl_read_inprogress == 1'b0) && (avl_read_en_s == 1'b1)) begin
avl_read <= 1'b1;
avl_read_inprogress <= 1'b1;
end else if (avl_read_inprogress == 1'b1) begin
avl_read <= 1'b0;
if (avl_readdatavalid == 1'b1) begin
avl_read_inprogress <= 1'b0;
end
end
end
end
assign avl_last_transfer_s = (avl_address == avl_last_address) ? 1'b1 : 1'b0;
always @(posedge avl_clk) begin
avl_burstcount <= 1'b1;
avl_byteenable <= (avl_last_transfer_s) ? avl_last_byteenable : {64{1'b1}};
avl_last_transfer <= avl_last_transfer_s;
end
// write data from Avalon interface into the async FIFO
assign avl_mem_wr_enable_s = avl_readdatavalid & avl_ready;
always @(posedge avl_clk) begin
if (avl_reset == 1'b1) begin
avl_mem_data <= 0;
avl_mem_wr_enable <= 0;
end else begin
avl_mem_wr_enable <= avl_mem_wr_enable_s;
if (avl_mem_wr_enable_s == 1'b1) begin
avl_mem_data <= avl_data;
end
end
end
always @(posedge avl_clk) begin
if ((avl_reset == 1'b1) || (avl_xfer_req == 1'b0)) begin
avl_mem_wr_address <= 0;
avl_mem_wr_address_g <= 0;
end else begin
if (avl_mem_wr_enable == 1'b1) begin
avl_mem_wr_address <= avl_mem_wr_address + 1;
end
avl_mem_wr_address_g <= avl_mem_wr_address_b2g_s;
end
end
ad_b2g #(
.DATA_WIDTH(AVL_MEM_ADDRESS_WIDTH)
) i_avl_mem_wr_address_b2g (
.din (avl_mem_wr_address),
.dout (avl_mem_wr_address_b2g_s));
// ==========================================================================
// control the FIFO to prevent overflow, underfloq is monitored
// ==========================================================================
assign avl_mem_rd_address_s = (MEM_RATIO == 1) ? avl_mem_rd_address :
(MEM_RATIO == 2) ? avl_mem_rd_address[(DAC_MEM_ADDRESS_WIDTH-1):1] :
(MEM_RATIO == 4) ? avl_mem_rd_address[(DAC_MEM_ADDRESS_WIDTH-1):2] :
(MEM_RATIO == 8) ? avl_mem_rd_address[(DAC_MEM_ADDRESS_WIDTH-1):3] :
(MEM_RATIO == 16) ? avl_mem_rd_address[(DAC_MEM_ADDRESS_WIDTH-1):4] :
avl_mem_rd_address[(DAC_MEM_ADDRESS_WIDTH-1):5];
assign avl_mem_address_diff_s = {1'b1, avl_mem_wr_address} - avl_mem_rd_address_s;
always @(posedge avl_clk) begin
if (avl_xfer_req == 1'b0) begin
avl_mem_address_diff <= 'd0;
avl_mem_rd_address <= 'd0;
avl_mem_rd_address_m1 <= 'd0;
avl_mem_rd_address_m2 <= 'd0;
avl_mem_request_data <= 'd0;
end else begin
avl_mem_rd_address_m1 <= dac_mem_rd_address_g;
avl_mem_rd_address_m2 <= avl_mem_rd_address_m1;
avl_mem_rd_address <= avl_mem_rd_address_g2b_s;
avl_mem_address_diff <= avl_mem_address_diff_s[AVL_MEM_ADDRESS_WIDTH-1:0];
if (avl_mem_address_diff >= AVL_MEM_THRESHOLD_HI) begin
avl_mem_request_data <= 1'b0;
end else if (avl_mem_address_diff <= AVL_MEM_THRESHOLD_LO) begin
avl_mem_request_data <= 1'b1;
end
end
end
ad_g2b #(
.DATA_WIDTH(DAC_MEM_ADDRESS_WIDTH)
) i_avl_mem_rd_address_g2b (
.din (avl_mem_rd_address_m2),
.dout (avl_mem_rd_address_g2b_s));
avl_dacfifo_byteenable_decoder #(
.MEM_RATIO (MEM_RATIO),
.LAST_BEATS_WIDTH (MEM_WIDTH_DIFF)
) i_byteenable_decoder (
.avl_clk (avl_clk),
.avl_byteenable (avl_last_byteenable),
.avl_enable (1'b1),
.avl_last_beats (avl_last_beats_s)
);
// ==========================================================================
// Push data from the async FIFO to the DAC
// Data flow is controlled by the DAC, no back-pressure. If FIFO is not
// ready, data will be dropped
// ==========================================================================
assign dac_mem_wr_address_s = (MEM_RATIO == 1) ? dac_mem_wr_address :
(MEM_RATIO == 2) ? {dac_mem_wr_address, 1'b0} :
(MEM_RATIO == 4) ? {dac_mem_wr_address, 2'b0} :
(MEM_RATIO == 8) ? {dac_mem_wr_address, 3'b0} :
(MEM_RATIO == 16) ? {dac_mem_wr_address, 4'b0} :
{dac_mem_wr_address, 5'b0};
assign dac_mem_address_diff_s = {1'b1, dac_mem_wr_address_s} - dac_mem_rd_address;
always @(posedge dac_clk) begin
if (dac_reset == 1'b1) begin
dac_mem_wr_address_m2 <= 0;
dac_mem_wr_address_m1 <= 0;
dac_mem_wr_address <= 0;
dac_mem_wr_last_address <= 0;
end else begin
dac_mem_wr_address_m1 <= avl_mem_wr_address_g;
dac_mem_wr_address_m2 <= dac_mem_wr_address_m1;
dac_mem_wr_address <= dac_mem_wr_address_g2b_s;
dac_mem_wr_last_address <= (dac_avl_last_transfer == 1'b1) ? dac_mem_wr_address_s : dac_mem_wr_last_address;
end
end
ad_g2b #(
.DATA_WIDTH(AVL_MEM_ADDRESS_WIDTH)
) i_dac_mem_wr_address_g2b (
.din (dac_mem_wr_address_m2),
.dout (dac_mem_wr_address_g2b_s));
always @(posedge dac_clk) begin
if (dac_reset == 1'b1) begin
dac_avl_last_transfer_m1 <= 0;
dac_avl_last_transfer_m2 <= 0;
dac_avl_last_transfer <= 0;
end else begin
dac_avl_last_transfer_m1 <= (avl_last_transfer & avl_readdatavalid);
dac_avl_last_transfer_m2 <= dac_avl_last_transfer_m1;
dac_avl_last_transfer <= dac_avl_last_transfer_m2;
end
end
always @(posedge dac_clk) begin
if (dac_reset == 1'b1) begin
dac_avl_xfer_req_m2 <= 0;
dac_avl_xfer_req_m1 <= 0;
dac_avl_xfer_req <= 0;
end else begin
dac_avl_xfer_req_m1 <= avl_xfer_req;
dac_avl_xfer_req_m2 <= dac_avl_xfer_req_m1;
dac_avl_xfer_req <= dac_avl_xfer_req_m2;
end
end
always @(posedge dac_clk) begin
if (dac_reset == 1'b1) begin
dac_mem_last_transfer_active <= 1'b0;
end else begin
if (dac_avl_last_transfer == 1'b1) begin
dac_mem_last_transfer_active <= 1'b1;
end else if (dac_mem_rd_address == dac_mem_rd_last_address) begin
dac_mem_last_transfer_active <= 1'b0;
end
end
end
assign dac_mem_rd_enable_s = (dac_mem_address_diff[DAC_MEM_ADDRESS_WIDTH-1:0] == 1'b0) ? 0 : (dac_xfer_req & dac_valid);
always @(posedge dac_clk) begin
if ((dac_reset == 1'b1) || ((dac_avl_xfer_req == 1'b0) && (dac_xfer_req == 1'b0))) begin
dac_mem_rd_address <= 0;
dac_mem_rd_address_g <= 0;
dac_mem_address_diff <= 0;
dac_mem_rd_last_address <= 0;
end else begin
dac_mem_address_diff <= dac_mem_address_diff_s[DAC_MEM_ADDRESS_WIDTH-1:0];
dac_mem_rd_last_address <= dac_mem_wr_last_address + avl_last_beats_s;
if (dac_mem_rd_enable_s == 1'b1) begin
dac_mem_rd_address <= ((dac_mem_rd_address == dac_mem_rd_last_address) && (dac_mem_last_transfer_active == 1'b1)) ?
(dac_mem_wr_last_address + {MEM_WIDTH_DIFF{1'b1}} + 1) :
(dac_mem_rd_address + 1);
end
dac_mem_rd_address_g <= dac_mem_rd_address_b2g_s;
end
end
ad_b2g #(
.DATA_WIDTH(DAC_MEM_ADDRESS_WIDTH)
) i_dac_mem_rd_address_b2g (
.din (dac_mem_rd_address),
.dout (dac_mem_rd_address_b2g_s));
always @(posedge dac_clk) begin
if (dac_reset == 1'b1) begin
dac_xfer_req <= 0;
end else begin
if ((dac_avl_xfer_req == 1'b1) && (dac_mem_address_diff > 0)) begin
dac_xfer_req <= 1'b1;
end else if ((dac_avl_xfer_req == 1'b0) && (dac_mem_address_diff_s[DAC_MEM_ADDRESS_WIDTH-1:0] == 0)) begin
dac_xfer_req <= 1'b0;
end
end
end
always @(posedge dac_clk) begin
if ((dac_reset == 1'b1) || (dac_xfer_req == 1'b0)) begin
dac_data <= 0;
end else begin
dac_data <= dac_mem_data_s;
end
end
always @(posedge dac_clk) begin
if ((dac_reset == 1'b1) || (dac_xfer_req == 1'b0)) begin
dac_dunf <= 1'b0;
end else begin
dac_dunf <= (dac_mem_address_diff == 0) ? 1'b1 : 1'b0;
end
end
endmodule
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