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AR# 32368

11.1 PlanAhead - I cannot constrain my differential I/Os for Spartan-3 VQ100 and TQ144 packages


PlanAhead does not allow me to constrain my differential I/Os to all valid differential locations.  


Why is PlanAhead preventing me from constraining my differential I/O?


This is a known issue with PlanAhead for Spartan-3 devices with VQ100 and TQ144 packages.  


To work around this issue, use the Automotive Spartan-3 devices with the same package; Analysis with Spartan-3 and Automotive Spartan-3 is the equivalent.

AR# 32368
Date Created 04/23/2009
Last Updated 05/23/2014
Status Archive
Type General Article