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`timescale 1ns / 1ps
module testbench_alu();
reg reset = 0;
reg [1023:0] testvec_filename;
reg [1023:0] waveform_filename;
initial begin
if ($value$plusargs("testvec=%s", testvec_filename)) begin
$display("Using test vector file: %s", testvec_filename);
end else begin
$display("Error: no test vector file specified.");
$finish;
end
if ($value$plusargs("waveform=%s", waveform_filename)) begin
$display("Using waveform file: %s", waveform_filename);
end else begin
$display("Error: no waveform file specified.");
$finish;
end
end
initial begin
$dumpfile(waveform_filename);
$dumpvars(0,testbench_alu);
end
reg clk = 0;
always #32 clk = !clk;
reg [31:0] a, b, exp_result;
reg [3:0] op;
reg [3:0] exp_flags;
wire [31:0] result;
wire zero, exp_zero;
assign exp_zero = exp_flags[0];
reg [31:0] alu_test_count, alu_error_count;
reg [103:0] alu_testvec [0:9999];
initial begin
#5;
$readmemh(testvec_filename, alu_testvec);
alu_test_count = 0;
alu_error_count = 0;
end
always @ (posedge clk) begin
#16;
{op, a, b, exp_result, exp_flags} = alu_testvec[alu_test_count];
#32;
if ((result !== exp_result) | (zero !== exp_zero)) begin
$display("ERROR (ALU) time: %5d, test: %d", $time, alu_test_count);
$display(" op: %b, a: %h b: %h", op, a, b);
$display(" result: %h (expected %h)", result, exp_result);
$display(" zero: %b (expected %b)", zero, exp_zero);
alu_error_count = alu_error_count + 1;
end
alu_test_count = alu_test_count + 1;
if ((alu_test_count == 9027)) begin
$display("FINISHED (ALU), %d tests completed with %d errors", alu_test_count, alu_error_count);
#16;
$finish;
end
end
alu #(.N(32)) alu (
.src0(a),
.src1(b),
.op(op),
.result(result),
.zero(zero)
);
endmodule
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