RE: [SI-LIST] : Input switching threshold & CPCI

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From: Abe Riazi (ariazi@anigma.com)
Date: Mon Jan 03 2000 - 09:43:13 PST


D. C. Sessions Wrote:
>
>PCI does the old (idiotic) 0.8-2.0 input thresholds that were first
>documented on cave walls. In contrast, anyone trying to do serious
>signaling at nontrivial speeds uses very tight thresholds, usually
>scaled to the driver supply and usually with differential receivers.
>
Hi D. C.,

This is a good point. For 3.3 V signaling, the input voltage threshold
values (based on PCI specs) consist of:

Minimum Vih (Input High Voltage) = 0.5 Vcc
Maximum Vil (Input Low Voltage) = 0.3 Vcc

Regards,

Abe
>ariazi@anigma.com

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