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test: validate parametric 32x4 layer with parallelism 8

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michele
2026-09-02 09:27:04 +02:00
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`timescale 1ns/1ps
module tb;
parameter DATA_WIDTH = 16;
parameter FRAC_BITS = 8;
parameter N_INPUTS = 32;
parameter N_NEURONS = 4;
parameter PARALLEL = 8;
parameter ACC_WIDTH = 40;
reg clk;
reg rst;
reg start;
reg signed [DATA_WIDTH*N_INPUTS-1:0] x_bus;
reg signed [DATA_WIDTH*N_INPUTS*N_NEURONS-1:0]
weights_bus;
reg signed [DATA_WIDTH*N_NEURONS-1:0]
bias_bus;
wire signed [DATA_WIDTH*N_NEURONS-1:0]
y_bus;
wire busy;
wire done;
integer i;
integer n;
integer errors;
integer expected;
layer #(
.DATA_WIDTH(DATA_WIDTH),
.FRAC_BITS(FRAC_BITS),
.N_INPUTS(N_INPUTS),
.N_NEURONS(N_NEURONS),
.PARALLEL(PARALLEL),
.ACC_WIDTH(ACC_WIDTH)
) dut (
.clk(clk),
.rst(rst),
.start(start),
.x_bus(x_bus),
.weights_bus(weights_bus),
.bias_bus(bias_bus),
.y_bus(y_bus),
.busy(busy),
.done(done)
);
initial begin
clk = 0;
forever #5 clk = ~clk;
end
function signed [15:0] q8_8;
input real value;
begin
q8_8 = $rtoi(value * 256.0);
end
endfunction
task run_layer;
begin
@(posedge clk);
start = 1;
@(posedge clk);
start = 0;
wait(done == 1);
@(posedge clk);
end
endtask
initial begin
$dumpfile("sim/parametric.vcd");
$dumpvars(0, tb);
rst = 1;
start = 0;
x_bus = 0;
weights_bus = 0;
bias_bus = 0;
errors = 0;
repeat (2) @(posedge clk);
rst = 0;
/*
* All inputs = 1.0
*/
for (i = 0; i < N_INPUTS; i = i + 1)
x_bus[i*DATA_WIDTH +: DATA_WIDTH] = q8_8(1.0);
/*
* Neuron 0: weight = 1.0
* result = N_INPUTS
*/
for (i = 0; i < N_INPUTS; i = i + 1)
weights_bus[
0*N_INPUTS*DATA_WIDTH +
i*DATA_WIDTH +:
DATA_WIDTH
] = q8_8(1.0);
/*
* Neuron 1: weight = 0.5
* result = N_INPUTS / 2
*/
if (N_NEURONS > 1)
for (i = 0; i < N_INPUTS; i = i + 1)
weights_bus[
1*N_INPUTS*DATA_WIDTH +
i*DATA_WIDTH +:
DATA_WIDTH
] = q8_8(0.5);
/*
* Neuron 2: weight = -0.5
* ReLU -> 0
*/
if (N_NEURONS > 2)
for (i = 0; i < N_INPUTS; i = i + 1)
weights_bus[
2*N_INPUTS*DATA_WIDTH +
i*DATA_WIDTH +:
DATA_WIDTH
] = q8_8(-0.5);
/*
* Neuron 3: weight = 2.0
* Large positive result -> saturation
*/
if (N_NEURONS > 3)
for (i = 0; i < N_INPUTS; i = i + 1)
weights_bus[
3*N_INPUTS*DATA_WIDTH +
i*DATA_WIDTH +:
DATA_WIDTH
] = q8_8(2.0);
/*
* Neuron 4: zero weights + bias +1
*/
if (N_NEURONS > 4)
bias_bus[4*DATA_WIDTH +: DATA_WIDTH] = q8_8(1.0);
/*
* Neuron 5: zero weights + bias -1
* ReLU -> 0
*/
if (N_NEURONS > 5)
bias_bus[5*DATA_WIDTH +: DATA_WIDTH] = q8_8(-1.0);
/*
* Neuron 6: weight 1.0 + bias -1.0
* result = N_INPUTS - 1
*/
if (N_NEURONS > 6) begin
for (i = 0; i < N_INPUTS; i = i + 1)
weights_bus[
6*N_INPUTS*DATA_WIDTH +
i*DATA_WIDTH +:
DATA_WIDTH
] = q8_8(1.0);
bias_bus[6*DATA_WIDTH +: DATA_WIDTH] = q8_8(-1.0);
end
/*
* Neuron 7: weight 0.25 + bias 1
* result = N_INPUTS/4 + 1
*/
if (N_NEURONS > 7) begin
for (i = 0; i < N_INPUTS; i = i + 1)
weights_bus[
7*N_INPUTS*DATA_WIDTH +
i*DATA_WIDTH +:
DATA_WIDTH
] = q8_8(0.25);
bias_bus[7*DATA_WIDTH +: DATA_WIDTH] = q8_8(1.0);
end
$display("");
$display("========================================");
$display("PARAMETRIC LAYER TEST");
$display("N_INPUTS = %0d", N_INPUTS);
$display("N_NEURONS = %0d", N_NEURONS);
$display("PARALLEL = %0d", PARALLEL);
$display("========================================");
run_layer;
/*
* Neuron 0
*/
expected = N_INPUTS * 256;
if (y_bus[0*16 +: 16] !== expected[15:0]) begin
$display("FAIL N0: got %0d expected %0d",
y_bus[0*16 +: 16], expected);
errors = errors + 1;
end
else
$display("PASS N0: %0d", y_bus[0*16 +: 16]);
/*
* Neuron 1
*/
if (N_NEURONS > 1) begin
expected = (N_INPUTS * 128);
if (y_bus[1*16 +: 16] !== expected[15:0]) begin
$display("FAIL N1: got %0d expected %0d",
y_bus[1*16 +: 16], expected);
errors = errors + 1;
end
else
$display("PASS N1: %0d", y_bus[1*16 +: 16]);
end
/*
* Neuron 2
*/
if (N_NEURONS > 2) begin
expected = 0;
if (y_bus[2*16 +: 16] !== 16'sd0) begin
$display("FAIL N2: got %0d expected 0",
y_bus[2*16 +: 16]);
errors = errors + 1;
end
else
$display("PASS N2: 0 (ReLU)");
end
/*
* Neuron 3:
* weight = 2.0
* result = N_INPUTS * 2.0
*
* Saturation only occurs when result > 127.996...
*/
if (N_NEURONS > 3) begin
expected = N_INPUTS * 2 * 256;
if (expected > 32767)
expected = 32767;
if (y_bus[3*16 +: 16] !== expected[15:0]) begin
$display("FAIL N3: got %0d expected %0d",
y_bus[3*16 +: 16], expected);
errors = errors + 1;
end
else begin
if (expected == 32767)
$display("PASS N3: %0d (saturation)", y_bus[3*16 +: 16]);
else
$display("PASS N3: %0d", y_bus[3*16 +: 16]);
end
end
/*
* Neuron 4
*/
if (N_NEURONS > 4) begin
if (y_bus[4*16 +: 16] !== 16'sd256) begin
$display("FAIL N4: got %0d expected 256",
y_bus[4*16 +: 16]);
errors = errors + 1;
end
else
$display("PASS N4: 256 (bias)");
end
/*
* Neuron 5
*/
if (N_NEURONS > 5) begin
if (y_bus[5*16 +: 16] !== 16'sd0) begin
$display("FAIL N5: got %0d expected 0",
y_bus[5*16 +: 16]);
errors = errors + 1;
end
else
$display("PASS N5: 0 (negative bias + ReLU)");
end
/*
* Neuron 6
*/
if (N_NEURONS > 6) begin
expected = (N_INPUTS - 1) * 256;
if (y_bus[6*16 +: 16] !== expected[15:0]) begin
$display("FAIL N6: got %0d expected %0d",
y_bus[6*16 +: 16], expected);
errors = errors + 1;
end
else
$display("PASS N6: %0d", y_bus[6*16 +: 16]);
end
/*
* Neuron 7
*/
if (N_NEURONS > 7) begin
expected = (N_INPUTS / 4 + 1) * 256;
if (y_bus[7*16 +: 16] !== expected[15:0]) begin
$display("FAIL N7: got %0d expected %0d",
y_bus[7*16 +: 16], expected);
errors = errors + 1;
end
else
$display("PASS N7: %0d", y_bus[7*16 +: 16]);
end
if (busy !== 0) begin
$display("FAIL: busy still active");
errors = errors + 1;
end
if (done !== 1) begin
$display("FAIL: done not asserted");
errors = errors + 1;
end
$display("");
$display("========================================");
if (errors == 0)
$display("PARAMETRIC TEST PASSED");
else
$display("PARAMETRIC TEST FAILED: %0d errors", errors);
$display("========================================");
$display("");
$finish;
end
endmodule