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pluto_hdl_adi/library/util_mfifo/util_mfifo.v

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// ***************************************************************************
// ***************************************************************************
// Copyright 2014 - 2017 (c) Analog Devices, Inc. All rights reserved.
//
// 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
// the repository (LICENSE_GPL2), and at: <https://www.gnu.org/licenses/old-licenses/gpl-2.0.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/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 util_mfifo #(
parameter NUM_OF_CHANNELS = 4,
parameter DIN_DATA_WIDTH = 32,
parameter ADDRESS_WIDTH = 8) (
// d-in interface
input din_rst,
input din_clk,
input din_valid,
input [DIN_DATA_WIDTH-1:0] din_data_0,
input [DIN_DATA_WIDTH-1:0] din_data_1,
input [DIN_DATA_WIDTH-1:0] din_data_2,
input [DIN_DATA_WIDTH-1:0] din_data_3,
input [DIN_DATA_WIDTH-1:0] din_data_4,
input [DIN_DATA_WIDTH-1:0] din_data_5,
input [DIN_DATA_WIDTH-1:0] din_data_6,
input [DIN_DATA_WIDTH-1:0] din_data_7,
// d-out interface
input dout_rst,
input dout_clk,
output reg dout_valid,
output [15:0] dout_data_0,
output [15:0] dout_data_1,
output [15:0] dout_data_2,
output [15:0] dout_data_3,
output [15:0] dout_data_4,
output [15:0] dout_data_5,
output [15:0] dout_data_6,
output [15:0] dout_data_7);
// internal registers
reg din_dout_toggle_m1 = 'd0;
reg din_dout_toggle_m2 = 'd0;
reg din_dout_toggle_m3 = 'd0;
reg din_wr = 'd0;
reg [(ADDRESS_WIDTH-1):0] din_waddr = 'd0;
reg din_enable = 'd0;
reg din_toggle = 'd0;
reg dout_din_toggle_m1 = 'd0;
reg dout_din_toggle_m2 = 'd0;
reg dout_din_toggle_m3 = 'd0;
reg [ 4:0] dout_cnt = 'd0;
reg dout_ld = 'd0;
reg dout_ld_d = 'd0;
reg [(ADDRESS_WIDTH-1):0] dout_raddr = 'd0;
reg dout_enable = 'd0;
reg dout_toggle = 'd0;
reg [(DIN_DATA_WIDTH-1):0] dout_rdata_0 = 'd0;
reg [(DIN_DATA_WIDTH-1):0] dout_rdata_1 = 'd0;
reg [(DIN_DATA_WIDTH-1):0] dout_rdata_2 = 'd0;
reg [(DIN_DATA_WIDTH-1):0] dout_rdata_3 = 'd0;
reg [(DIN_DATA_WIDTH-1):0] dout_rdata_4 = 'd0;
reg [(DIN_DATA_WIDTH-1):0] dout_rdata_5 = 'd0;
reg [(DIN_DATA_WIDTH-1):0] dout_rdata_6 = 'd0;
reg [(DIN_DATA_WIDTH-1):0] dout_rdata_7 = 'd0;
// internal signals
wire [(DIN_DATA_WIDTH-1):0] din_wdata_s[0:7];
wire din_waddr_max_s;
wire din_dout_toggle_s;
wire dout_raddr_max_s;
wire dout_rd_s;
wire dout_din_toggle_s;
wire [(DIN_DATA_WIDTH-1):0] dout_rdata_s[0:7];
// variables
genvar n;
// write interface
assign din_wdata_s[7] = din_data_7;
assign din_wdata_s[6] = din_data_6;
assign din_wdata_s[5] = din_data_5;
assign din_wdata_s[4] = din_data_4;
assign din_wdata_s[3] = din_data_3;
assign din_wdata_s[2] = din_data_2;
assign din_wdata_s[1] = din_data_1;
assign din_wdata_s[0] = din_data_0;
assign din_waddr_max_s = & din_waddr;
assign din_dout_toggle_s = din_dout_toggle_m3 ^ din_dout_toggle_m2;
always @(posedge din_clk or posedge din_rst) begin
if (din_rst == 1'b1) begin
din_dout_toggle_m1 <= 1'd0;
din_dout_toggle_m2 <= 1'd0;
din_dout_toggle_m3 <= 1'd0;
din_wr <= 1'd0;
din_waddr <= 'd0;
din_enable <= 1'd0;
din_toggle <= 1'd0;
end else begin
din_dout_toggle_m1 <= dout_toggle;
din_dout_toggle_m2 <= din_dout_toggle_m1;
din_dout_toggle_m3 <= din_dout_toggle_m2;
din_wr <= din_valid & din_enable;
if (din_dout_toggle_s == 1'b1) begin
din_waddr <= 'd0;
din_enable <= 1'b1;
end else if (din_wr == 1'b1) begin
din_waddr <= din_waddr + 1'b1;
if (din_waddr_max_s == 1) begin
din_enable <= 1'b0;
end
end
if ((din_wr == 1'b1) && (din_waddr_max_s == 1)) begin
din_toggle <= ~din_toggle;
end
end
end
// read interface
assign dout_raddr_max_s = & dout_raddr;
assign dout_rd_s = (dout_cnt == 5'd0) ? dout_enable : 1'b0;
assign dout_din_toggle_s = dout_din_toggle_m3 ^ dout_din_toggle_m2;
always @(posedge dout_clk or posedge dout_rst) begin
if (dout_rst == 1'b1) begin
dout_din_toggle_m1 <= 1'd0;
dout_din_toggle_m2 <= 1'd0;
dout_din_toggle_m3 <= 1'd0;
dout_cnt <= 'd0;
dout_ld <= 'd0;
dout_ld_d <= 'd0;
dout_raddr <= 'd0;
dout_enable <= 1'd0;
dout_toggle <= 1'd1;
end else begin
dout_din_toggle_m1 <= din_toggle;
dout_din_toggle_m2 <= dout_din_toggle_m1;
dout_din_toggle_m3 <= dout_din_toggle_m2;
if ((dout_din_toggle_s == 1'b1) || (dout_cnt >= ((DIN_DATA_WIDTH/16) - 1))) begin
dout_cnt <= 'd0;
end else begin
dout_cnt <= dout_cnt + 1'b1;
end
dout_ld <= | dout_cnt;
dout_ld_d <= dout_ld;
if (dout_din_toggle_s == 1'b1) begin
dout_raddr <= 'd0;
dout_enable <= 1'b1;
end else if (dout_rd_s == 1'b1) begin
dout_raddr <= dout_raddr + 1'b1;
if (dout_raddr_max_s == 1'b1) begin
dout_enable <= 1'b0;
end
end
if ((dout_rd_s == 1'b1) && (dout_raddr_max_s == 1'b1)) begin
dout_toggle <= ~dout_toggle;
end
end
end
always @(posedge dout_clk or posedge dout_rst) begin
if (dout_rst == 1'b1) begin
dout_valid <= 'd0;
dout_rdata_0 <= 'd0;
dout_rdata_1 <= 'd0;
dout_rdata_2 <= 'd0;
dout_rdata_3 <= 'd0;
dout_rdata_4 <= 'd0;
dout_rdata_5 <= 'd0;
dout_rdata_6 <= 'd0;
dout_rdata_7 <= 'd0;
end else begin
if (dout_ld_d == 1'b0) begin
dout_valid <= dout_enable;
dout_rdata_0 <= dout_rdata_s[0];
dout_rdata_1 <= dout_rdata_s[1];
dout_rdata_2 <= dout_rdata_s[2];
dout_rdata_3 <= dout_rdata_s[3];
dout_rdata_4 <= dout_rdata_s[4];
dout_rdata_5 <= dout_rdata_s[5];
dout_rdata_6 <= dout_rdata_s[6];
dout_rdata_7 <= dout_rdata_s[7];
end else begin
dout_valid <= dout_valid;
dout_rdata_0 <= {16'd0, dout_rdata_0[(DIN_DATA_WIDTH-1):16]};
dout_rdata_1 <= {16'd0, dout_rdata_1[(DIN_DATA_WIDTH-1):16]};
dout_rdata_2 <= {16'd0, dout_rdata_2[(DIN_DATA_WIDTH-1):16]};
dout_rdata_3 <= {16'd0, dout_rdata_3[(DIN_DATA_WIDTH-1):16]};
dout_rdata_4 <= {16'd0, dout_rdata_4[(DIN_DATA_WIDTH-1):16]};
dout_rdata_5 <= {16'd0, dout_rdata_5[(DIN_DATA_WIDTH-1):16]};
dout_rdata_6 <= {16'd0, dout_rdata_6[(DIN_DATA_WIDTH-1):16]};
dout_rdata_7 <= {16'd0, dout_rdata_7[(DIN_DATA_WIDTH-1):16]};
end
end
end
assign dout_data_0 = dout_rdata_0[15:0];
assign dout_data_1 = dout_rdata_1[15:0];
assign dout_data_2 = dout_rdata_2[15:0];
assign dout_data_3 = dout_rdata_3[15:0];
assign dout_data_4 = dout_rdata_4[15:0];
assign dout_data_5 = dout_rdata_5[15:0];
assign dout_data_6 = dout_rdata_6[15:0];
assign dout_data_7 = dout_rdata_7[15:0];
// instantiations
generate
if (NUM_OF_CHANNELS < 8) begin
for (n = NUM_OF_CHANNELS; n < 8; n = n + 1) begin: g_channels_unused
assign dout_rdata_s[n] = 'd0;
end
end
for (n = 0; n < NUM_OF_CHANNELS; n = n + 1) begin: g_channels
ad_mem #(
.ADDRESS_WIDTH (ADDRESS_WIDTH),
.DATA_WIDTH (DIN_DATA_WIDTH))
i_mem (
.clka (din_clk),
.wea (din_wr),
.addra (din_waddr),
.dina (din_wdata_s[n]),
.clkb (dout_clk),
.addrb (dout_raddr),
.doutb (dout_rdata_s[n]));
end
endgenerate
endmodule
// ***************************************************************************
// ***************************************************************************
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