[SI-LIST] Re: Package Model in IBIS
- From: "Beal, Weston" <Weston_Beal@xxxxxxxxxx>
- To: Newbie Pugal <pugal8686@xxxxxxxx>, "si-list@xxxxxxxxxxxxx" <si-list@xxxxxxxxxxxxx>
- Date: Mon, 27 Jun 2011 16:04:38 +0000
Pugal,
If the package pin length is much shorter than the signal rise/fall time then a
lumped RLC model is adequate to model the effect that the package has on the
signal. Also, the lumped L and C values can be used to calculate the effective
impedance (sqrt(L/C)) and delay (sqrt(LC)) of the pin. This assumption is good
as long as the delay is much shorter than the signal rise/fall time. As the
rise/fall time approaches the delay calculated from the lumped pin model, the
model becomes gradually less accurate. Depending on your accuracy needs, you
need to use a correct distributed package model when the delay through the
package is 1/10 to 1/6 the rise/fall time.
Regards,
Weston
-----Original Message-----
From: si-list-bounce@xxxxxxxxxxxxx [mailto:si-list-bounce@xxxxxxxxxxxxx] On
Behalf Of Newbie Pugal
Sent: Monday, June 27, 2011 7:38 AM
To: si-list@xxxxxxxxxxxxx
Subject: [SI-LIST] Package Model in IBIS
Hi All,
I'm Little confused with the package model definition in IBIS.
As far as I understand we can add Package model command and provide the package
model details like RLC and length details.
My doubt is if we do not have the package Model definition in the IBIS file
will the RLC values given for each pin consider as a package model? If so the
Length details are ignored?
What is the use of the lumped RLC values provided in the IBIS file?
Since I'm new to SI Please provide some basic information about Package Model
in IBIS.
Thanks
Pugal
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