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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, 2005 by Wilson Snyder.
// SPDX-License-Identifier: CC0-1.0
//
// Example module to create problem.
//
// generate a 64 bit value with bits
// [HighMaskSel_Bot : LowMaskSel_Bot ] = 1
// [HighMaskSel_Top+32: LowMaskSel_Top+32] = 1
// all other bits zero.
module t (/*AUTOARG*/
// Inputs
clk
);
input clk;
integer cyc; initial cyc = 0;
reg [7:0] crc;
reg [63:0] sum;
/*AUTOWIRE*/
// Beginning of automatic wires (for undeclared instantiated-module outputs)
wire [63:0] HighLogicImm; // From example of example.v
wire [63:0] LogicImm; // From example of example.v
wire [63:0] LowLogicImm; // From example of example.v
// End of automatics
wire [5:0] LowMaskSel_Top = crc[5:0];
wire [5:0] LowMaskSel_Bot = crc[5:0];
wire [5:0] HighMaskSel_Top = crc[5:0]+{4'b0,crc[7:6]};
wire [5:0] HighMaskSel_Bot = crc[5:0]+{4'b0,crc[7:6]};
example example (/*AUTOINST*/
// Outputs
.LogicImm (LogicImm[63:0]),
.LowLogicImm (LowLogicImm[63:0]),
.HighLogicImm (HighLogicImm[63:0]),
// Inputs
.LowMaskSel_Top (LowMaskSel_Top[5:0]),
.HighMaskSel_Top (HighMaskSel_Top[5:0]),
.LowMaskSel_Bot (LowMaskSel_Bot[5:0]),
.HighMaskSel_Bot (HighMaskSel_Bot[5:0]));
always @ (posedge clk) begin
cyc <= cyc + 1;
crc <= {crc[6:0], ~^ {crc[7],crc[5],crc[4],crc[3]}};
`ifdef TEST_VERBOSE
$write("[%0t] cyc==%0d crc=%b %d.%d,%d.%d -> %x.%x -> %x\n", $time, cyc, crc,
LowMaskSel_Top, HighMaskSel_Top, LowMaskSel_Bot, HighMaskSel_Bot,
LowLogicImm, HighLogicImm, LogicImm);
`endif
if (cyc==0) begin
// Single case
crc <= 8'h0;
sum <= 64'h0;
end
else if (cyc==1) begin
// Setup
crc <= 8'hed;
sum <= 64'h0;
end
else if (cyc<90) begin
sum <= {sum[62:0],sum[63]} ^ LogicImm;
end
else if (cyc==99) begin
$write("[%0t] cyc==%0d crc=%b %x\n", $time, cyc, crc, sum);
if (crc !== 8'b00111000) $stop;
if (sum !== 64'h58743ffa61e41075) $stop;
$write("*-* All Finished *-*\n");
$finish;
end
end
endmodule
module example (/*AUTOARG*/
// Outputs
LogicImm, LowLogicImm, HighLogicImm,
// Inputs
LowMaskSel_Top, HighMaskSel_Top, LowMaskSel_Bot, HighMaskSel_Bot
);
input [5:0] LowMaskSel_Top, HighMaskSel_Top;
input [5:0] LowMaskSel_Bot, HighMaskSel_Bot;
output [63:0] LogicImm;
output [63:0] LowLogicImm, HighLogicImm;
wire [63:0] LowLogicImm, HighLogicImm;
/* verilator lint_off UNSIGNED */
/* verilator lint_off CMPCONST */
genvar i;
generate
for (i=0;i<64;i=i+1) begin : MaskVal
if (i >= 32) begin
assign LowLogicImm[i] = (LowMaskSel_Top <= i[5:0]);
assign HighLogicImm[i] = (HighMaskSel_Top >= i[5:0]);
end
else begin
assign LowLogicImm[i] = (LowMaskSel_Bot <= i[5:0]);
assign HighLogicImm[i] = (HighMaskSel_Bot >= i[5:0]);
end
end
endgenerate
/* verilator lint_on UNSIGNED */
/* verilator lint_on CMPCONST */
assign LogicImm = LowLogicImm & HighLogicImm;
endmodule
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