Using ModelSim it looks like the seed random call with $srandom
does not apply to subsequent random value generation with $urandom_range
.
Running the process:
initial
begin
$srandom(42);
$display("1: %0d, %0d, %0d", $urandom_range(1, 10), $urandom_range(1, 10), $urandom_range(1, 10));
$srandom(42);
$display("2: %0d, %0d, %0d", $urandom_range(1, 10), $urandom_range(1, 10), $urandom_range(1, 10));
$srandom(42);
$display("3: %0d, %0d, %0d", $urandom_range(1, 10), $urandom_range(1, 10), $urandom_range(1, 10));
end
the output is:
# 1: 3, 1, 7
# 2: 9, 7, 2
# 3: 6, 4, 8
However, I had expected that line 1, 2 and 3 where identical, since $srandom
was called be fore with same seed value.
Why are the generated values not the same?
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