AR# 8085: 2.1i XC9500 Family Hprep6 - Create Programmable Grounds doesn't seem to work on all unused IO
AR# 8085
2.1i XC9500 Family Hprep6 - Create Programmable Grounds doesn't seem to work on all unused IO
Description
Keywords: 9500xl programmable ground
Urgency: Standard
General Description: Create Programmable Grounds does not appear work on all pins. Some unused I/Os appear to be tristated with a weak pullup while most appear to be grounded.
Solution
There was a bug in hprep6 that spanned all 9500/XL devices. The situation that causes programmable grounds to fail is if a macrocell is used, but the pin is not - then the pin is not grounded.