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// DESCRIPTION: Verilator: Verilog Test module
//
// This file ONLY is placed under the Creative Commons Public Domain, for
// any use, without warranty, 2006 by Wilson Snyder.
// SPDX-License-Identifier: CC0-1.0
module t (/*AUTOARG*/
// Inputs
clk
);
input clk;
integer cyc; initial cyc=0;
reg [63:0] crc;
wire [65:0] outData; // From fifo of fifo.v
wire [15:0] inData = crc[15:0];
wire [1:0] inWordPtr = crc[17:16];
wire wrEn = crc[20];
wire [1:0] wrPtr = crc[33:32];
wire [1:0] rdPtr = crc[34:33];
fifo fifo (
// Outputs
.outData (outData[65:0]),
// Inputs
.clk (clk),
.inWordPtr (inWordPtr[1:0]),
.inData (inData[15:0]),
.rdPtr (rdPtr),
.wrPtr (wrPtr),
.wrEn (wrEn));
always @ (posedge clk) begin
//$write("[%0t] cyc==%0d crc=%b q=%x\n",$time, cyc, crc, outData);
cyc <= cyc + 1;
crc <= {crc[62:0], crc[63]^crc[2]^crc[0]};
if (cyc==0) begin
// Setup
crc <= 64'h5aef0c8d_d70a4497;
end
else if (cyc==90) begin
if (outData[63:0] != 64'hd9bcbc276f0984ea) $stop;
end
else if (cyc==91) begin
if (outData[63:0] != 64'hef77cd9b13a866f0) $stop;
end
else if (cyc==92) begin
if (outData[63:0] != 64'h2750cd9b13a866f0) $stop;
end
else if (cyc==93) begin
if (outData[63:0] != 64'h4ea0bc276f0984ea) $stop;
end
else if (cyc==94) begin
if (outData[63:0] != 64'h9d41bc276f0984ea) $stop;
end
else if (cyc==99) begin
$write("*-* All Finished *-*\n");
$finish;
end
end
endmodule
module fifo (/*AUTOARG*/
// Outputs
outData,
// Inputs
clk, inWordPtr, inData, wrPtr, rdPtr, wrEn
);
parameter fifoDepthLog2 = 1;
parameter fifoDepth = 1<<fifoDepthLog2;
`define PTRBITS (fifoDepthLog2+1)
`define PTRBITSM1 fifoDepthLog2
`define PTRBITSM2 (fifoDepthLog2-1)
input clk;
input [1:0] inWordPtr;
input [15:0] inData;
input [`PTRBITSM1:0] wrPtr;
input [`PTRBITSM1:0] rdPtr;
output [65:0] outData;
input wrEn;
reg [65:0] outData;
// verilator lint_off VARHIDDEN
// verilator lint_off LITENDIAN
reg [65:0] fifo[0:fifoDepth-1];
// verilator lint_on LITENDIAN
// verilator lint_on VARHIDDEN
//reg [65:0] temp;
always @(posedge clk) begin
//$write ("we=%x PT=%x ID=%x D=%x\n", wrEn, wrPtr[`PTRBITSM2:0], {1'b0,~inWordPtr,4'b0}, inData[15:0]);
if (wrEn) begin
fifo[ wrPtr[`PTRBITSM2:0] ][{1'b0,~inWordPtr,4'b0}+:16] <= inData[15:0];
// Equivelent to:
//temp = fifo[ wrPtr[`PTRBITSM2:0] ];
//temp [{1'b0,~inWordPtr,4'b0}+:16] = inData[15:0];
//fifo[ wrPtr[`PTRBITSM2:0] ] <= temp;
end
outData <= fifo[rdPtr[`PTRBITSM2:0]];
end
endmodule
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