[SI-LIST] Re: Vih for PCI
- From: James_R_Jones@xxxxxxxx
- To: marko.pulli@xxxxxxxxx, Andrew.Ingraham@xxxxxx,si-list@xxxxxxxxxxxxx
- Date: Wed, 10 Jul 2002 09:08:54 -0500
The input thresholds guarantee a high at the input voltage above a certain
voltage threshold, and a low below a certain voltage threshold. The design
of the silicon input stage is up to each individual vendor. But he can only
say that is component is PCI compliant if his input trip point is between
the two thresholds.
JR
-----Original Message-----
From: marko.pulli@xxxxxxxxx [mailto:marko.pulli@xxxxxxxxx]
Sent: Wednesday, July 10, 2002 8:44 AM
To: Andrew.Ingraham@xxxxxx; si-list@xxxxxxxxxxxxx
Subject: [SI-LIST] Re: Vih for PCI
Hi,
Thanks for the information!
Just curious - How are the two different input voltage treshold levels =
managed in the chip when it's 3.3V and 5V compatible? Does the pin have =
actually two input cells?
Br,
Marko
> -----Original Message-----
> From: ext Ingraham, Andrew [mailto:Andrew.Ingraham@xxxxxx]
> Sent: 09. July 2002 19:57
> To: si-list@xxxxxxxxxxxxx
> Subject: [SI-LIST] Re: Vih for PCI
>=20
>=20
> But I forgot to mention that I have known "PCI" cards (or shall I say,
> cards that can plug into a PCI connector and pretend to be PCI) that
> required a Vih(min) of 0.9*Vcc. Did not work unless the signal was 5V
> rail-to-rail.
>=20
> Andy
>=20
>=20
>=20
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