Re: Clarification Regarding Constant Analog UDF's

Hi Martin,
Okay so since we want to try and stay in sync with Verilog 1364, then 
sounds like we can also allow constant analog user defined functions, as 
well as recursively calling a analog UDF (I can do this in digital).

The restrictions on constant functions that digital mentions in 10.4.5 
(1364-2005) seem okay and we can adopt them where necessary although I 
can't think of any statements that are allowed in an analog UDF that 
couldn't be used in a constant context.
However I don't understand the last restriction that digital mentions:
" - They shall not themselves use constant functions in any context 
requiring a constant expression."

I wonder if that is a typo and should read "They shall themselves use 
....." as it seems strange to restrict a constant function from using a 
constant function.

Cheers...
Dave

Martin O'Leary wrote:
> Dave,
> this restriction may have been because we thought that 1364 didn't allow
> functions to appear in a parameter context.
>
> However I understand form one our Verilog experts this has been and 1364
> supports this with restrictions (see 10.3.5 of the 1364-2001)
>
> Thanks,
> --Martin
>
> -----Original Message-----
> From: owner-verilog-ams@eda.org [mailto:owner-verilog-ams@eda.org] On
> Behalf Of Dave Miller
> Sent: Tuesday, October 10, 2006 8:55 AM
> To: Verilog-AMS LRM Committee
> Subject: Clarification Regarding Constant Analog UDF's
>
> Hello Graham, Hello all,
> During last weeks call I inquired as to why we don't allow constant
> analog user defined functions within the new revised BNF. Unfortunately
> I didn't properly document the reasoning that was given and now I can't
> remember.
>
> Would it not also be a good idea to allow constant analog UDF's? I was
> thinking this would be useful also in a analog only context as it would
> give the option of assigning a complex expression to a parameter using a
> analog UDF instead of using a macro function for example. This would
> allow more flexibility for the user.
>
> Regards
> Dave
>
> --
> =====================================
> -- David Miller
> -- Design Technology (Austin)
> -- Freescale Semiconductor
> -- Ph : 512 996-7377 Fax: x7755
> =====================================
>
>
>   


-- 
=====================================
-- David Miller
-- Design Technology (Austin)
-- Freescale Semiconductor
-- Ph : 512 996-7377 Fax: x7755
=====================================