RE: [sv-ac] question on system functions

Hi Lisa,

 

Please, see my comments below.

 

Thanks,

Dmitry

 

From: owner-sv-ac@server.eda.org [mailto:owner-sv-ac@server.eda.org] On
Behalf Of Lisa Piper
Sent: Tuesday, September 16, 2008 11:08 PM
To: sv-ac@server.eda.org
Subject: [sv-ac] question on system functions

 

Hi all,

I have a few questions on system functions($onehot, $countones,
$isunknown, $onehot0):

1.      Is it desired that these be able to be used in HDL?

[Korchemny, Dmitry] It is not stated anywhere that they cannot be used
in HDL, I don't see implementation issues with it either.

2.      What datatypes should be supported?  Should they be restricted
to packed and vector datatypes? (exclude noninteger types (real ...),
strings, event, chandle, class, associative arrays, dynamic objects)

[Korchemny, Dmitry] I could not find a satisfactory answer in the LRM,
though my interpretation that their argument should be of an integral
type. Since they are declared as expressions, they cannot be unpacked
arrays or structures.

Lisa


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