In the Revision History Table of XAPP450, the latest revision notes state that the Spartan-IIE Power Sequencing section was removed. What affect does this have, if any, on existing designs?
XAPP 450: Power-On Requirements for Spartan-II and Spartan-IIE Families (v1.1):
There is no action necessary and no work to be done for existing designs using Spartan-IIE. The removal of this section of the Application Note simply reflects the elimination of the power sequence requirement for Spartan-IIE devices. If your application followed this recommendation, your design will continue to work as expected and no action is necessary.