Subject: Re: [IBIS-Users] Pin name assignment
From: Robert Haller (rhaller@sisoft.com)
Date: Fri Jan 31 2003 - 09:44:18 PST
Frank you hit my Pet peeve,
I think when designers/engineers (module, asic, semiconductor and SI)
use special characters in signal names, pin names or node names they are
asking for trouble. Most CAD tools can elegantly deal with 'special
characters' like -+=!@#$%^&*() and operating system can even deal with
them if they are quoted or backslashed or whatever.
But inevitably somewhere in your entire process flow you will run into a
problem and consume wasted time debugging a problem that can simple be
avoided by using intelligent naming conventions.
My suggestion is when you start a project write a design guide that sets
up naming conventions and stick to them. Push back on those designs,
models, etc that use special characters that can easily be avoided.
my $0.02
bob
Frank Dunlap wrote:
> I think that the suggestion to stay with a-z and 0-9 characters (and to
> start the name
> with a-z) is a good, safe idea. I have seen cases, however, where IBIS
> models used
> a trailing "#' to indicated active low. Such signals show up in certain
> vendor's datasheets and
> their IBIS models. Isn't a good idea, though maybe not a requirement,
> to use the
> EXACT same name in the IBIS model as is used in the datasheet, as these
> vendors
> have done?
>
> So, though it's a great suggestion to use just a-z and 0-9, are there
> any known
> issues in using other characters, and, in this case, specifically, "#"?
>
> Thanks,
>
> Frank
>
> -----Original Message-----
> *From:* Abdulrahman Rafiq [mailto:arafiqsi@yahoo.com]
> *Sent:* Friday, January 31, 2003 12:07 AM
> *To:* Eric Hsu; ibis-users@server.eda.org
> *Subject:* Re: [IBIS-Users] Pin name assignment
>
> Hi Eric,
>
> I take it you are trying to create a pin list for an ibis file. You
> can find information on this in the IBIS Information Specification
> Ver 3.2 http://www.vhdl.org/pub/ibis/ver3.2/ver3_2.pdf
>
> The number of characters allowed per column in the pinlist section
> of the ibis model are as followed:
>
> [Pin]: Max 5 characters allowed
>
> signal_name: Max 20 characters allowed
>
> model_name: Max 20 characters allowed
>
> R_pin: Max 9 characters allowed
>
> L_pin: Max 9 characters allowed
>
> C_pin: Max 9 characters allowed
>
> I would suggest avoiding using symbols other than integers
> (1,2,3,...) and letters (A,B,C,...) in in the [Pin] column.
>
> See the document in the link specified above, it show a sample
> pinlist section.
>
> Hope this helps.
>
> Thanks,
>
> Abdulrahman Rafiq
>
> arafiqsi@yahoo.com <mailto:arafiqsi@yahoo.com>
>
> */Eric Hsu <ehsu@netlogicmicro.com>/* wrote:
>
> Hi all,
>
> When assigning for pin name, I am not sure there is any limits
> except column length. of character. For example, if naming by
> "#", "", "(xxx)", "!", or even "%"? In case they can pass by
> "ibischk3", does it also mean they are acceptable by any
> commercial simulation tool as long as it can accept IBIS format?
>
> Best Regard,
>
> Eric
>
> NetLogic Microsystems, Inc.
>
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-- Robert J. Haller (rhaller@sisoft.com) Principal Consultant Signal Integrity Software Inc. 6 Clock Tower Place, Suite 250 Maynard, MA 01754 Phone: (978) 461-0449, ext 15|------------------------------------------------------------------ |For help or to subscribe/unsubscribe, email majordomo@eda.org |with just the appropriate command message(s) in the body: | | help | subscribe ibis <optional e-mail address, if different> | subscribe ibis-users <optional e-mail address, if different> | unsubscribe ibis <optional e-mail address, if different> | unsubscribe ibis-users <optional e-mail address, if different> | |or email a written request to ibis-request@eda.org. | |IBIS reflector archives exist under: | | http://www.eda.org/pub/ibis/email_archive/ Recent | http://www.eda.org/pub/ibis/users_archive/ Recent | http://www.eda.org/pub/ibis/email/ E-mail since 1993
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