Subject: [IBIS-Users] Buffer ramp rates & loading question.
From: John Phillippe (john.phillippe@motorola.com)
Date: Thu Feb 13 2003 - 15:20:25 PST
Hello People,
I have a few quick questions below:
1. I have gotten a few warnings about the power clamp values that never
become zero. How can I fix the warnings?
WARNING - Model Pad_fc_drive10: POWER Clamp : Minimum value never
becomes zero
2. I have some slow I/O drivers that take a long time to settle for the
rising and falling curves. To help the curves settle faster, I want
to use 300 Ohms for the load. Normally I would use 50 Ohms load for the
I/O drivers. I am wondering if I can use 300 Ohms load for the slow
drivers? Is it going to be a simulator problem if some of the buffers
use 50 Ohm loads, and others 300 Ohms loads?
3. The keyword [Ramp] gives you the ramp rate on how long it takes the
output to switch from one state to another. It is define by 20% to 80%
voltage swing of the output to the time it takes to swing the voltage.
What is the pin loading used for this measurement?
-- John Phillippe SPS, 32 Bit Embedded Controller Division, IC Creation Motorola - 512-895-1835 Austin, TX - john.phillippe@motorola.com|------------------------------------------------------------------ |For help or to subscribe/unsubscribe, email majordomo@eda.org |with just the appropriate command message(s) in the body: | | help | subscribe ibis <optional e-mail address, if different> | subscribe ibis-users <optional e-mail address, if different> | unsubscribe ibis <optional e-mail address, if different> | unsubscribe ibis-users <optional e-mail address, if different> | |or email a written request to ibis-request@eda.org. | |IBIS reflector archives exist under: | | http://www.eda.org/pub/ibis/email_archive/ Recent | http://www.eda.org/pub/ibis/users_archive/ Recent | http://www.eda.org/pub/ibis/email/ E-mail since 1993
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