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Control line pull-ups on mixed 3v/5v system

To: "'pci-sig@znyx.com'" <pci-sig@znyx.com>
Subject: Control line pull-ups on mixed 3v/5v system
From: Wayne Eckertson <WayneEckertson@VersaLogic.com>
Date: Mon, 22 Jul 2002 12:25:19 -0700
Resent-Date: Mon, 22 Jul 2002 12:33:24 -0700
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Title: Control line pull-ups on mixed 3v/5v system

I am designing a system which will support either 3V or 5V PCI adapter cards (not at the same time). On-board devices are 3.3V, 5V tolerant. Which rail should the control lines be pulled to? More simply, will a 3V only device have problems if the control lines are pulled to the 5V rail and vise-versa?

Wayne Eckertson
waynee@versalogic.com
R+D Engineer
VersaLogic Corp

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