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Altera_Forum
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11 years ago

Generating Random Byte values

Hi, I am writing vhdl process that can generate random 8-bit(1 byte) values so that I can send that values to RAM which has 10 addresses. How can I do? Thanks
Altera_Forum's avatar
Altera_Forum
Icon for Honored Contributor rankHonored Contributor
11 years ago

if it is only for simulation, then you can use the uniform procedure from the math_real package. It generates random values in the range 0 - 1 that can then be used to scale other number. For example: 


use ieee.math_real.all;
variable seed1, seed2 : positive;
variable rand  : real;
variable rand_int : integer;
...
uniform(seed1, seed2, rand);
rand_int := integer( trunc(256 * rand) );

Remember, this code cannot be synthesised into an FPGA.