RE: disabling event functions

Ken, Geoffrey,
I think we could also allow passing of a NULL argument as the time tol
to resolve this issue 

i.e.;
 @(timer(0, 1n,, 0))
               ^- this is a NULL argument in Verilog.

Thanks,
--Martin
-----Original Message-----
From: owner-verilog-ams@eda.org [mailto:owner-verilog-ams@eda.org] On
Behalf Of Ken Kundert
Sent: Tuesday, September 04, 2007 7:36 PM
To: Geoffrey.Coram
Cc: verilog-AMS LRM Committee
Subject: Re: disabling event functions

Geoffrey,
    Of course you are right, and that is unfortunate. However, as
tolerances must be positive, it would be possible to indicate that a
non-positive tolerance is ignored. In that way
    @(timer(0, 1n, 0, 0))
could represent a disabled timer function with default tolerances.

-Ken

Geoffrey.Coram wrote:
> Ken -
> My first reaction is that, at least for timer(), you would then be 
> required to specify the time tolerance:
> 
> timer( start_time [, period [, time_tol [, enable]]] );
> 
> which might or might not be desirable.
> 
> -Geoffrey
> 
> 
> Ken Kundert wrote:
>> Gentlemen,
>>     I have run across another situation where it would have been 
>> helpful to be able to disable an event function. Earlier I suggested 
>> that setting the direction argument of the cross function to 
>> something other than -1, 0, or +1 should disable it. This is 
>> important because events in an analog simulator are expensive. I have

>> now found that it would be useful to be able to disable the timer 
>> function. And by extension, it seems like a good idea to be able to
disable the above function as well.
>>
>> I would like to suggest that we add boolean argument to each of the 3

>> analog event functions (cross, above, & timer) that can be used to 
>> disable them.
>>
>> Comments?
>>
>> -Ken
>>
> 

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