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SYSTEM VERILOG Randomization queries
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NARESH SAMBHNANI  
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 More options Jul 18 2012, 2:21 am
Newsgroups: comp.lang.verilog
From: NARESH SAMBHNANI <naresh.the....@gmail.com>
Date: Tue, 17 Jul 2012 23:21:51 -0700 (PDT)
Local: Wed, Jul 18 2012 2:21 am
Subject: SYSTEM VERILOG Randomization queries
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I am facing a problem in randomizing an array. As per my need:-
I have an array of 16 elements having 9 bits each. My need is to set 15 elements to a known value and have to randomize an element. which element has to be randomized is to be choosen randomly. And only one element has to be randomized.

One solution i have seen that randomize the element inside the constraints and map the fixed values in post_randomized task.

Is there any other way to this stuff ??


 
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Robert Miles  
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 More options Jul 19 2012, 10:14 am
Newsgroups: comp.lang.verilog
From: Robert Miles <mile...@Usenet-News.net>
Date: Thu, 19 Jul 2012 09:14:42 -0500
Local: Thurs, Jul 19 2012 10:14 am
Subject: Re: SYSTEM VERILOG Randomization queries
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On 7/18/2012 1:21 AM, NARESH SAMBHNANI wrote:

> I am facing a problem in randomizing an array. As per my need:-
> I have an array of 16 elements having 9 bits each. My need is to set 15 elements to a known value and have to randomize an element. which element has to be randomized is to be choosen randomly. And only one element has to be randomized.

> One solution i have seen that randomize the element inside the constraints and map the fixed values in post_randomized task.

> Is there any other way to this stuff ??

An idea to consider:  Set up another array with 9 bits but only one
element.  Randomize this new array.  Set the 15 elements of the
original array to their known values.  Make a random choice of one
of the 15 elements, then copy the contents of the new array into
that element.

 
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Marcus Harnisch  
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 More options Jul 30 2012, 1:11 pm
Newsgroups: comp.lang.verilog
From: Marcus Harnisch <marcus.harni...@doulos.com>
Date: Mon, 30 Jul 2012 19:11:27 +0200
Local: Mon, Jul 30 2012 1:11 pm
Subject: Re: SYSTEM VERILOG Randomization queries
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NARESH SAMBHNANI <naresh.the....@gmail.com> writes:
> My need is to set 15 elements to a known value and have to randomize
> an element.

Are these known values always the same? Could you provide an example?
From the little we know about the actual requirements, I would probably
not randomize the array itself but use separate rand variables for both
index and value and assign the results in post_randomize, as you
suggested.

Cheers
Marcus


 
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