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  1. Xilinx - All Programmable
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  3. 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.

This is fixed in the latest version of software available at:
http://support.xilinx.com/support/techsup/sw_updates/
AR# 8085
Date 08/27/2001
Status Archive
Type General Article