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AR# 13191

9.1i MAP - Conflicting constraints on a register results in a "WARNING:Pack:680 - The register symbol ..." message


If a register has an IOB=TRUE property and is also area-constrained to a group of slices, the register is mapped to a slice and MAP displays the following warning message:  


"WARNING:Pack:680 - The register symbol core/the_signoise/Dac[10] has the property IOB=TRUE, but failed to join an I/O component. Please try constraining the register together with a valid pad or I/O buffer symbol."


The message is correct; however, it does not identify the conflict that prevents the IOB pack. There are no plans to modify this behavior. It is possible to override the AREA GROUP constraint with a LOC constraint to a specific IOB site.

AR# 13191
Date Created 08/29/2007
Last Updated 05/14/2014
Status Archive
Type General Article