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randomize method

SystemVerilog 4901
pre_randomize & post... 1
anvesh dangeti
anvesh dangeti
Full Access
26 posts
November 20, 2020 at 7:49 am

What are the common and good usage of pre_randomize() and post_randomize() in SystemVerilog?

I list out the some usages:
pre_randomize & post_randomize function can have several uses based on the application.
Here is the list of few usage of those functions.
>Both functions can be overridden, and hence it can be possible to modify the randomization behavior with extended class
>Turn on/off few random variables
>Turn on/off few constraints
>Assignments to other nonrandom variable, on which the randomization is dependent
>Changing the weight of random variables, based on certain conditions

I got this much of information. if any one having extra knowledge please share me?

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puttasatish
puttasatish
Full Access
58 posts
November 22, 2020 at 9:04 pm

In reply to anvesh dangeti:

1. Calculating CRC or parity based on the random values generated. It can be done in the post_randomize()
2. Printing the random values immediately after randomization. It may help in debugging sometimes.
3. If the next values of random values are dependent on the previous random values, then, some kind of analysis can be done either in pre/post randomization methods to decide the next set of random numbers.

Hope this helps.
Putta Satish

dave_59
dave_59
Forum Moderator
8466 posts
November 23, 2020 at 7:51 am

In reply to anvesh dangeti:

I would not use pre/post_randomize to turn on or off random variables. Some cases it's too late because the random mode affects whether pre/post randomize gets called

— Dave Rich, Verification Architect, Siemens EDA

anvesh dangeti
anvesh dangeti
Full Access
26 posts
November 29, 2020 at 8:19 pm

than what is the main use of pre_randomize() and post_randomize() methods?

dave_59
dave_59
Forum Moderator
8466 posts
November 29, 2020 at 9:14 pm

In reply to anvesh dangeti:

Everything else that is already been mentioned.

— Dave Rich, Verification Architect, Siemens EDA

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