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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, 2024 by PlanV GmbH.
// SPDX-License-Identifier: CC0-1.0
`define check_rand(cl, field) \
begin \
longint prev_result; \
int ok = 0; \
void'(cl.randomize()); \
prev_result = longint'(field); \
repeat(9) begin \
longint result; \
void'(cl.randomize()); \
result = longint'(field); \
if (result != prev_result) ok = 1; \
prev_result = result; \
end \
if (ok != 1) $stop; \
end
class con_rand_1d_array_test;
rand bit [7:0] data[5];
constraint c_data {
foreach (data[i]) {
data[i] inside {8'h10, 8'h20, 8'h30, 8'h40, 8'h50};
}
}
function new();
data = '{default: 'h0};
endfunction
function void check_randomization();
foreach (data[i]) begin
`check_rand(this, data[i])
if (data[i] inside {8'h10, 8'h20, 8'h30, 8'h40, 8'h50}) begin
$display("data[%0d] = %h is valid", i, data[i]);
end else begin
$display("Error: data[%0d] = %h is out of bounds", i, data[i]);
$stop;
end
end
endfunction
endclass
class con_rand_2d_array_test;
rand bit [7:0] data[3][3];
constraint c_data {
foreach (data[i, j]) {
data[i][j] >= 8'h10;
data[i][j] <= 8'h50;
}
}
function new();
data = '{default: '{default: 'h0}};
endfunction
function void check_randomization();
foreach (data[i, j]) begin
`check_rand(this, data[i][j])
if (data[i][j] >= 8'h10 && data[i][j] <= 8'h50) begin
$display("data[%0d][%0d] = %h is valid", i, j, data[i][j]);
end else begin
$display("Error: data[%0d][%0d] = %h is out of bounds", i, j, data[i][j]);
$stop;
end
end
endfunction
endclass
class con_rand_3d_array_test;
rand bit [7:0] data[2][2][2];
constraint c_data {
foreach (data[i, j, k]) {
data[i][j][k] >= 8'h10;
data[i][j][k] <= 8'h50;
if (i > 0) {
data[i][j][k] > data[i-1][j][k] + 8'h05;
}
if (j > 0) {
data[i][j][k] > data[i][j-1][k];
}
}
}
function new();
data = '{default: '{default: '{default: 'h0}}};
endfunction
function void check_randomization();
foreach (data[i, j, k]) begin
`check_rand(this, data[i][j][k])
if (data[i][j][k] >= 8'h10 && data[i][j][k] <= 8'h50) begin
if (i > 0 && data[i][j][k] <= data[i-1][j][k] + 8'h05) begin
$display("Error: data[%0d][%0d][%0d] = %h does not satisfy i > 0 constraint", i, j, k, data[i][j][k]);
$stop;
end
if (j > 0 && data[i][j][k] <= data[i][j-1][k]) begin
$display("Error: data[%0d][%0d][%0d] = %h does not satisfy j > 0 constraint", i, j, k, data[i][j][k]);
$stop;
end
$display("data[%0d][%0d][%0d] = %h is valid", i, j, k, data[i][j][k]);
end else begin
$display("Error: data[%0d][%0d][%0d] = %h is out of bounds", i, j, k, data[i][j][k]);
$stop;
end
end
endfunction
endclass
module t_constraint_unpacked_array;
con_rand_1d_array_test rand_test_1;
con_rand_2d_array_test rand_test_2;
con_rand_3d_array_test rand_test_3;
initial begin
// Test 1: Randomization for 1D array
$display("Test 1: Randomization for 1D array:");
rand_test_1 = new();
repeat(2) begin
rand_test_1.check_randomization();
end
// Test 2: Randomization for 2D array
$display("Test 2: Randomization for 2D array:");
rand_test_2 = new();
repeat(2) begin
rand_test_2.check_randomization();
end
// Test 3: Randomization for 3D array
$display("Test 3: Randomization for 3D array:");
rand_test_3 = new();
repeat(2) begin
rand_test_3.check_randomization();
end
$write("*-* All Finished *-*\n");
$finish;
end
endmodule
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