[SOLVED] $urandom_range is generating same values

[swabhi812]

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]

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]

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!