Re: [IBIS] SI_location / Timing_Location

Actually, Si_location and Timing_location go back to 1997 and were
introduced by Bob Ross of Interconnectix (pre-Mentor)

http://www.eda.org/ibis/birds/bird43.txt

Timing_location may also need to be changed to die for large FPGA type
devices, because of large non-monotonic signals at the pins.




On Tue, Aug 27, 2013 at 1:30 PM, Robert Haller <rhaller@enterasys.com>wrote:

> I think the SiSoft guys probably pushed for this a while ago. Their
> software can do chip to chip timing either at pin or pad (on either end of
> transmission line). Usually one performs static timing from pin to pin
> because then there is no double counting when using data sheet timing
> specs. But if you are designing the silicon and the package, there are
> good reasons to perform timing pad to pad when you are trying to shave
> picoseconds.
> Regards
> Bob
>
> -----Original Message-----
> From: owner-ibis@eda.org [mailto:owner-ibis@eda.org] On Behalf Of Aubrey
> Sparkman
> Sent: Monday, August 26, 2013 2:19 PM
> To: Muranyi, Arpad
> Cc: IBIS; IBIS-users
> Subject: Re: [IBIS] SI_location / Timing_Location
>
> I have used these switches, though I'm not sure I gave them different
> values.
>
> Possible scenario...   Interface specs timing at pin, but I want to make
> sure edges are monotonic at the silicon.
>
> Just a though.
>
> Aubrey Sparkman
>
> Sent from my iPhone
>
> On Aug 26, 2013, at 11:44 AM, "Muranyi, Arpad" <Arpad_Muranyi@mentor.com>
> wrote:
>
> > Hello IBIS experts,
> >
> > Someone asked me the question whether Si_location and Timing_Location
> > can have two different values because they have an IBIS file which
> > does that.
> >
> > In attempt to answer their question, I searched the IBIS specification
> > for Si_location and only found this sentence on pg. 16 (in v5.1):
> >
> > "Si_location and Timing_location are optional and specify where the
> Signal Integrity and Timing measurements are made for the component.
> Allowed values for either subparameter are "Die" or "Pin". The default
> location is at the "Pin"."
> >
> > I found no other occurrences of "Si_location" or "Timing_location"
> > in the entire specification, i.e. their meaning, usage and purpose are
> > not defined.  Or am I missing something?
> >
> > Going back to the original question, does it make sense to have two
> > different values for these two parameters?
> >
> > Thanks,
> >
> > Arpad
> > =====================================================================
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