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Re: PRSNT1 & PRSNT2 Signals on backplane
- To: Mailing List Recipients <pci-sig-request@znyx.com>
- Subject: Re: PRSNT1 & PRSNT2 Signals on backplane
- From: Andy Ingraham <ingraham@wrksys.ENET.dec.com>
- Date: Tue, 20 Aug 96 18:18:24 EDT
- Apparently-To: pci-sig@znyx.com
- Cc: ingraham@wrksys.ENET.dec.com
- Resent-Date: Tue, 20 Aug 96 18:18:24 EDT
- Resent-From: pci-sig-request@znyx.com
- Resent-Message-Id: <"kM2OB.0.o93.IhZ6o"@dart>
- Resent-Sender: pci-sig-request@znyx.com
Jason Trizna asks what to do with the PRSNTn# signals on a passive
backplane.
Presumably, you're asking because you are making a passive backplane
and want to know what to do with them. Since the use of these signals
is optional on motherboards (sec. 2.2.8, 4.3.7), you can use them or
not use them as you choose.
If the passive backplane has *only* PCI connectors and no other
connections or functions whatsoever, it sounds like you can't do
anything with them. Maybe you could bring them to headers or another
connector that could be used if something in the future wanted to know
who was out there and had no other way to tell.
Don't forget the 0.01uF capacitors on both pins on each PCI connector,
whether you use the pins or not.
Regards,
Andy Ingraham
Y „ q