Home Specman / e How To Validate Type-Casting In OVM-e

Search

How To Validate Type-Casting In OVM-e PDF Print E-mail
User Rating: / 0
PoorBest 
Thursday, 24 December 2009 16:37

Before type-casting an e variable ("as_a"), we often want to check the validity of the operation (this is quite similar in concept to $cast in SystenVerilog). The reason is simple, in case the casting operation failed we would end up with a fatal error at run-time that otherwise could have been avoided. But how?

 

Here's one elegant way to do it:

type ttt: [E1=3, E2=10];
extend sys {
 run() is also {
 var x: byte = 3; // try x=7 too
  if x.as_a(ttt) in all_values(ttt) then { out( *** X IS IN RANGE *** ) };
 };
 };

In this small example we were trying to convert (type-cast) x from byte to ttt. The method all_values() returns a list of all possible scalar types (in our case - for type ttt). Try this code with x=3 and with x=7 and see what happens.

 

 
More articles :

» Method Manipulation In SV and e

If you're familiar with SystemVerilog and taking your first steps in e (or vice versa) you might find this useful. Here are some of the most common method manipulations that you''ll need to master and how you should go about implementing them in e...

» Inside The Verifiers Cubicle

Have you ever watched ? You know, the show where James Lipton hosts famous actors in front of a small audience of students? Remember? Anyway, this is actually one of my favorite shows on TV (and there aren’t that many really). Towards the end of...

» Cadence, Synopsys, Mentor - This Is Our Wish List

As the EDA industry seems to be making moves towards a Unified Verification Methodology (OVM + VMM) we thought this would be a great opportunity to share a couple of things that have been on our wish-list for quite a while.

» How To Choose Your Verification Service Provider

If you’re looking for an outsourcing solution for your verification problem then a quick look around will tell you that there are many alternatives out there. The number of verification contractors has grown rapidly over the recent years and today...

» The Cost Of Verification

We spend about one third of our lives in bed, right? doesn’t it make sense then to buy a good bed and not a cheap one? The same can be said for your verification tools as you spend so much of your project time on verification. Buying cheaper tools...

Add comment


Security code
Refresh

Copyright © 2018 Think Verification - Tips & Insights on ASIC Verification. All Rights Reserved.
Joomla! is Free Software released under the GNU/GPL License.