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AR# 19830

6.3i CPLDFit CoolRunner-II - Output permanently set to 'Z' (high impedance, 3-state) fails to function in device


General Description:

When a user specifies in his design that a permanently 3-stated output is desired, the software implements this using an Open Drain configuration. This is incorrect, as the output should always be 3-stated, and not be dependant on an input.

This bug is present only when targeting a CoolRunner-II CPLD.


This problem has been fixed in the latest 6.3i Service Pack available at:

The first service pack containing the fix is 6.3i Service Pack 2.

AR# 19830
Date Created 09/03/2007
Last Updated 12/15/2012
Status Active
Type General Article