AR# 32368

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

描述

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?

解决方案

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
日期 05/23/2014
状态 Archive
Type 综合文章