[SOLVED] $urandom_range is generating same values

swabhi812 · Jul 23, 2019

I am writing a test bench where I am randomizing few inputs using $urandom_range(max,min). However, every time I am running my test, it is returning same value. I would like to understand why I am getting this issue.

Thanks!

dave_59 · Jul 24, 2019

That is the correct behavior - it's called random stability which allows you to debug your test should it fail. You need to change the initial seed if you want another set of random values. Using Modelsim/Questa, look up the vsim -sv_seed switch in the manual

swabhi812 · Jul 24, 2019

dave_59 said:
That is the correct behavior - it's called random stability which allows you to debug your test should it fail. You need to change the initial seed if you want another set of random values. Using Modelsim/Questa, look up the vsim -sv_seed switch in the manual

Thank you for detailed explanation. This makes sense to me. I was able to use -seed random in Cadence xrun to get desired behavior.

Thanks!

[SOLVED] $urandom_range is generating same values

swabhi812

Member level 2

dave_59

Advanced Member level 3

swabhi812

Member level 2

Similar threads

[SOLVED] $urandom_range is generating same values

swabhi812

Member level 2

dave_59

Advanced Member level 3

swabhi812

Member level 2

Similar threads

Privacy & Transparency

Privacy & Transparency