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Simon Tran
Simon Tran

Reputation: 2070

How can you get a binary number with n number of '1's in VHDL?

I want to generate a random number using uniform(). The maximum value must be equal to the maximum value of a N bit integer.

So I need to generate the value of a binary number with n '1's

Thank you

Upvotes: 0

Views: 518

Answers (1)

Juergen
Juergen

Reputation: 996

uniform gives you a real number ranging from 0.0 to 1.0. You need to scale it to fit the desired value range and optionally convert it into a std_logic_vector.

For example for a N bit target value:

uniform(seed1, seed2, rand);
rand_int := integer(floor(rand*2.0**N));
sig      <= std_logic_vector(to_unsigned(rand_int,N));

Upvotes: 1

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