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AR# 1703

XC7300: Can I use a product term Output Enable in a Fast Function Block (FFB)

Description

In XC7300 Fast Function Blocks (FFBs), can output enables be
driven by a product term (pterm) output?

Solution

FFBs must use FOE nets for all output enables. If you drive
an output enable with a pterm equation, the software will map
the equation to one of the global FOE nets. To do this it will
route the signal out to one of the FOE pins, and back in on a
global FOE net. This therefore requires the use of one of the 2
FOE pins.

AR# 1703
Date Created 01/15/1997
Last Updated 01/15/2003
Status Archive
Type General Article