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Re: Adapter board 3.3V regulators
- To: Mailing List Recipients <pci-sig-request@znyx.com>
- Subject: Re: Adapter board 3.3V regulators
- From: Andy Ingraham 19-Aug-1996 1208 <ingraham@wrksys.ENET.dec.com>
- Date: Mon, 19 Aug 96 12:19:45 EDT
- Apparently-To: pci-sig@znyx.com
- Cc: ingraham@wrksys.ENET.dec.com
- Resent-Date: Mon, 19 Aug 96 12:19:45 EDT
- Resent-From: pci-sig-request@znyx.com
- Resent-Message-Id: <"k3x_C1.0.m7.zM96o"@dart>
- Resent-Sender: pci-sig-request@znyx.com
> -> Please tell me what the best way to generate 3.3V on my PCI Local bus
> -> adapter card.
> Do you really need to? PCI Spec 2.1 requires 3.3V power rails even on a 5V
> signaling environment. See sec. 4.1.1.
You'd better look at section 4.3.4.1. The 3.3V power supply is optional
in the 5V environment; and the spec even encourages you not to use it if
it's there.
Regards,
Andy Ingraham
T