RE: [IBIS-Users] Diff Pin Question


Subject: RE: [IBIS-Users] Diff Pin Question
From: Muranyi, Arpad (arpad.muranyi@intel.com)
Date: Sat Jul 19 2003 - 16:22:52 PDT


Andis,

I don't remember seeing a response to your posting, so here is mine.
(Sorry for the delay).

You can use a negative number for the delay to describe that the
second pin (inverting output) is switching earlier than the first
pin (non-inverting output). If the delay value is positive, the
inverting output is switching later by that amount.

Arpad Muranyi
Intel Corporation
==================================================================

-----Original Message-----
From: Lauzums, Andris [mailto:ALAUZUMS@intersil.com]
Sent: Thursday, June 26, 2003 10:49 AM
To: ibis-users@eda.org
Subject: [IBIS-Users] Diff Pin Question

        
Hello-

I had a question about the [Diff_Pin] parameter in the IBIS
specification. In reference to t_delay, (min, typ, and max), where my
non-inverting ouput is output A, and my inverting output is B, I am
unclear about the following:

Does a positive (as opposed to negative) value in the t_delay column
mean that A occurs after B, or that B occurs after A? I have read the
IBIS specification for this parameter, and it states that "(t-delay
contains) launch delays of the non-inverting pins relative to the
inverting pins. The values can be of either polarity". It does not
seem to specify which way is positive, and which way is negative. This
is the source of my confusion.

Thank you for the help-

Andris Lauzums
Intersil Corporation
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