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3.3V Decoupling
- To: Mailing List Recipients <pci-sig-request@znyx.com>
- Subject: 3.3V Decoupling
- From: Jerry Sabath <sabath@atla3.agfa.com>
- Date: Thu, 21 Nov 1996 15:50:35 -0500
- Resent-Date: Thu, 21 Nov 1996 15:50:35 -0500
- Resent-From: pci-sig-request@znyx.com
- Resent-Message-Id: <"aWjvY.0.Jk4.A9Gbo"@dart>
- Resent-Sender: pci-sig-request@znyx.com
Section 4.4.2.1 of the PCI Spec Revision 2.1 states:
Additionally, all +3.3V pins (even if they are not actually
delivering power) . . . on the PCI edge connector provide
an AC return path, and must have plated edge fingers and be
coupled to the ground plane on the add-in board . . . to
ensure that they continue to function as efficient AC
reference points . . ."
Can someone explain why the specification does not allow
unplated fingers? Would a board with unplated +3.3V fingers
have significantly different characteristics than an
unpopulated PCI slot?
*********************
* Jerry Sabath *
* (508) 658-5600 *
* sabath@agfa.com *
*********************
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