Re: Minutes of the Verilog-AMS committee call: 15 May 2008

Hi all,

I am not sure whether we will be able to put this fix as part of this 
version of the LRM. Stu already sent me the document on Friday midnight 
(the clean and the change bar version) which included the fixes from 
mails from Marek and Marq in the clean version.

Interestingly for some reason, I have not received these documents in my 
Inbox - tho' he has tried sending it couple of times - probably the size 
of the documents is an issue. I am hoping i will be able to get my hands 
on the latest version and upload it before the meeting.

We might have to raise a Mantis ticket for this item which needs to be 
resolved in the next version, if it does not make it in LRM2.3

Regards,
Sri

Geoffrey.Coram wrote:
> Boris is correct that the example has an error; I think it is useful
> to have an example showing how $mfactor accumulates, so I would say
> we should change the module to
> 
> module module_c(p,n);
>   inout p,n;
>   electrical p,n;
>   parameter r=1.0;
>   (* desc="effective resistance" *) real reff;
>   analog begin
>     I(p,n) <+ V(p,n)/r;  // mfactor scaling of currents handled 
> automatically
>     reff = r / $mfactor; // the effective resistance = 1/42
>   end
> endmodule
> 
> 
> -Geoffrey
> 
> 
> 
> Boris Troyanovsky wrote:
>> Hi,
>>
>> I think there may also a pair of issues relating to the $mfactor
>> specification.
>>
>> Issue #1:
>> In section 6.3.6 (p. 123), the LRM states: "The simulator shall issue a
>> warning if it detects a misuse of the $mfactor in a manner that would
>> result in double-scaling." However, just a few lines down, the LRM 
>> states:
>> "The simulator will generate an error" for this situation. So I think we
>> should clarify whether this is in fact an error or a warning (my
>> recollection is that the original intent was to make it an error).
>>
>> Issue #2:
>> In Section 9.18 (page 221 / Example 1) the following module has an error:
>>
>> ===========================
>> module module_c(p,n);
>> inout p,n;
>> electrical p,n;
>> parameter r=1.0;
>> analog begin
>> I(p,n) <+ V(p,n)/(r/$mfactor); // the effective resistance = 1/42
>> end
>> endmodule
>> ===========================
>>
>> This usage of $mfactor is prohibited; we can't make explicit 
>> contributions
>> that depend on $mfactor. The example should probably be removed or 
>> altered.
>>
>> Regards,
>>
>> - Boris
> 

-- 
Srikanth Chandrasekaran
Design Technology (Tools Development)
Freescale Semiconductor Inc.
T:+91-120-439 5000 p:x3824 f: x5199

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