Mike,
While you are correct about pin to pin skew for differential pins,
the original question was “skew between pins of different drivers”, which
is not supported by IBIS.
Thanks,
Arpad
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From: ibis-bounce@xxxxxxxxxxxxx [mailto:ibis-bounce@xxxxxxxxxxxxx] On Behalf Of ;
Mike LaBonte
Sent: Sunday, September 10, 2017 10:12 AM
To: aessam@xxxxxxxxx; ibis@xxxxxxxxxxxxx; ibis-users@xxxxxxxxxxxxx
Subject: [ibis] Re: Skew between Data and clock pins in IBIS standard
The IBIS [Diff Pin] keyword, which associates two pins as members of a
differential pair, does provide for typ, min and max tdelay for drivers. An
example from the specification:
[Diff Pin] inv_pin vdiff tdelay_typ tdelay_min tdelay_max
|
3 4 150mV -1ns 0ns -2ns
The usage is explained as:
The fourth, fifth, and sixth columns, tdelay_typ, tdelay_min, and tdelay_max,
contain launch delays of the non-inverting pins relative to the inverting pins.
All of the numerical entries may be a positive, zero, or negative number.
Walter correctly points out that IBIS lacks much of the data necessary for full
timing analysis. However, it does provide for driver skew.
Mike
From: ibis-bounce@xxxxxxxxxxxxx<mailto:ibis-bounce@xxxxxxxxxxxxx>
[mailto:ibis-bounce@xxxxxxxxxxxxx] On Behalf Of Ahmed Essam
Sent: Sunday, September 10, 2017 5:30 AM
To: ibis@xxxxxxxxxxxxx<mailto:ibis@xxxxxxxxxxxxx>;
ibis-users@xxxxxxxxxxxxx<mailto:ibis-users@xxxxxxxxxxxxx>
Subject: [ibis] Skew between Data and clock pins in IBIS standard
Hi All,
Hope u are fine,i have a question about if the IBIS standard can support any
information about skew between pins of different drivers in the same component.
In my case , it is required to get the skew between clock and data pins .
Thanks,
Essam
