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AR# 20855

7.1i NGDBuild - Pullup is added to bus driven by multiple TBUFs without a message


Keywords: NGDBuild, Translate, TBUF, pullup, error, 459

Urgency: Standard

General Description:
When there is a common bus driven by multiple TBUFs in your design and there is a possibility of none of them driving, a pullup is automatically added to the bus by NGDBuild. In the event that you instantiate a pulldown on the same bus, the following error results.

"ERROR:NgdBuild:459 - logical net 'net_name' has both a pullup and a pulldown."


NGDBuild does not currently report that a pullup has been added. This will be added in a future release of design tools.

To work around this error, remove the pulldown on this bus from your design.
AR# 20855
Date Created 02/23/2005
Last Updated 02/21/2007
Status Archive
Type General Article