RE: [SI-LIST] : Clock Jitter

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From: Beal, Weston (weston_beal@mentorg.com)
Date: Tue Apr 24 2001 - 14:56:37 PDT


Dirgha,

Jitter is the difference between when a clock edge should occur and when it
actually occurs with respect to the previous clock edge. When you calculate
setup margin it involves one clock edge at the driver and the next clock
edge at the receiver so you add in the clock period and subtract out the
worst case edge to edge jitter. When you calculate the hold margin it is
the case where the driver and receiver are referencing the same clock edge
so jitter is NOT part of the calculation.

I've seen a lot of calculations that have the sum of skew and jitter as one
number that gets used in both the setup and hold margin calculation. I did
this for quite a while just "because that's the way we've always done it."
I finally realized that skew is always there, but jitter is not. Now my
life if more fulfilling :)

Regards,

Weston

-----Original Message-----
From: dkhatri [mailto:dkhatri@micron.com]
Sent: Tuesday, April 24, 2001 12:45 PM
To: si-list@silab.eng.sun.com
Subject: [SI-LIST] : Clock Jitter
Importance: Low

Hi all,
I have a question regarding the Clock jitter term. whether we should be
using CLOCK JITTER term in the Hold Equations or not.Can any body please
explain me whether we should or should not use it and why?

Thanks,
Dirgha Khatri
Simulation Engineer
Micron Technology

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