RE: [SI-LIST] : Simple load question

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From: Michael Nudelman (mnudelman@tellium.com)
Date: Wed Jan 24 2001 - 15:47:42 PST


Brent:

Transmission line for the driver is resistive ONLY.
When, however, the reflections reach the driver (especially weak one), they
form the exponent (actually well rounded by dispersion reflection steps)
which people mistakenly take for RC. The suspicion is exacerbated by the
fact, that the time constant of that exponent is the same as RC of
driver-line system. But it is not so.

-----Original Message-----
From: brent.dewitt@us.datex-ohmeda.com
[mailto:brent.dewitt@us.datex-ohmeda.com]
Sent: 24 января 2001 г. 05:58
To: si-list@silab.eng.sun.com
Subject: [SI-LIST] : Simple load question

One of our engineers is very concerned about the "maximum capacitive load"
specification on a processor he's using. This is a relatively fast part
with
rise and fall times on the order of 600 psec. The loads are distributed
across
several memory devices, anywhere from 1 to 9 inches away. Am I correct in
thinking that if the driver sees only the capacitive component of the
transmission line impedance initially and then the "reflected capacitance"
of
each input one round trip reflection time later?

Thanks,

Brent DeWitt

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