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AR# 31852

PlanAhead 11.1 - One or more Vr sites in bank I/O Bank occupied

Description

Keywords: Vref, IOStandards, bank

I receive the following error in PlanAhead DRC check:

"One or more Vr sites in bank I/O Bank occupied. Some terminals in this bank, for example terminals at sites need Vr"

What am I doing incorrectly?

Solution

This is a known issue with PlanAhead. It is incorrectly flagging Vref pins for certain devices. This has been fixed in the 11.2 release of PlanAhead.

Manually confirm that you are leaving the Vref pin open for the bank(s) in question or that the IOStandards used on the I/O on the bank do not require Vref. You can safely ignore this error after confirming that the above situation does not occur.
AR# 31852
Date Created 11/07/2008
Last Updated 07/21/2009
Status Active
Type General Article