[sv-ec] How to Seed std::randomize()

Hi,

The following came up in Verification Guild:

Item 30 - Topic: How to Seed std::randomize()
(http://verificationguild.com/modules.php?name=Forums&file=viewtopic&t=2
077)

Posted by: kgopikrishna at 19 Sep 2007, 02:09 AM EDT
Subject  : How to Seed std::randomize()

How to seed std::randomize()?
Is it Random stable ?

SV IEEE LRM
13.11 Randomization of scope variables-std::randomize()
Nothing is mentioned in this unit regarding this.


<pre>> 
> 13.13 Random stability
> The RNG is localized to threads and objects. Because the sequence of
random values returned by a thread or
> object is independent of the RNG in other threads or objects, this
property is called random stability. Random
> stability applies to the following:
> - The system randomization calls, $urandom() and $urandom_range()
> - The object and process random seeding method, srandom()
> - The object randomization method, randomize()
> 
> </pre>

Its mentioned that "object randomization method, randomize()
"
There is nothing mentioned about std::randomize()


(http://verificationguild.com/modules.php?name=Forums&file=viewtopic&p=9
429#9429)


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Posted by: cabriggs at 19 Sep 2007, 01:09 PM EDT
Subject  : Re: How to Seed std::randomize()

<pre>> How to seed std::randomize()?</pre>
Try checking your simulator docs for their specific method of seeding
the RNG from the command line. Here are the ones I know:

VCS: simv +ntb_random_seed=<seed>
Questa: vsim -sv_seed <seed>

-cb


(http://verificationguild.com/modules.php?name=Forums&file=viewtopic&p=9
440#9440)


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Posted by: kgopikrishna at 19 Sep 2007, 10:09 PM EDT
Subject  : 

Im looking for solution some thing similar to this...
 $urandom(seed)
 srandom(seed)
 process::self.srandom(seed)


(http://verificationguild.com/modules.php?name=Forums&file=viewtopic&p=9
447#9447)


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Posted by: vhdlcohen at 19 Sep 2007, 11:09 PM EDT
Subject  : 

<pre>> Im looking for solution some thing similar to this...
>  $urandom(seed)
>  srandom(seed)
>  process::self.srandom(seed)</pre>Frp P1800 LRM 
<pre>> The srandom() method allows manually seeding the Random Number
Generator (RNG) of objects or
> threads. The RNG of a process can be seeded using the srandom() method
of the process  The prototype of the srandom() method is:
> function void srandom( int seed );
> The srandom() method initializes an object's random number generator
using the value of the given seed.</pre>


(http://verificationguild.com/modules.php?name=Forums&file=viewtopic&p=9
449#9449)


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Posted by: kgopikrishna at 20 Sep 2007, 12:09 AM EDT
Subject  : 

Ben, I did not get answer to my question.
<pre>> 13.11 Randomization of scope variables-std::randomize()
> The scope randomize function, std::randomize(), enables users to
randomize data in the current scope without the need to define a class
or instantiate a class object.
> </pre>

Even if there is no class,randomize() is allowed.

P1800, section 13.12.3 wrote:
<pre>> 
> The srandom() method allows manually seeding the Random Number
Generator (RNG) of objects or threads. The RNG of a process can be
seeded using the srandom() method of the process The prototype of the
srandom() method is:
> function void srandom( int seed );
> The srandom() method initializes an object's random number generator
using the value of the given seed.
> </pre>

Srandom() is for objects and threads.

integer variable;
randomize( variable ) ;
Is it possible to include srandom(seed) in the above statement?



Shalom Bresticker
Intel Jerusalem LAD DA
+972 2 589-6852
+972 54 721-1033

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