We have detected your current browser version is not the latest one. Xilinx.com uses the latest web technologies to bring you the best online experience possible. Please upgrade to a Xilinx.com supported browser:Chrome, Firefox, Internet Explorer 11, Safari. Thank you!

AR# 16140

5.2i CPLD iMPACT CoolRunner-II XC2C384 - Global Clock 1 (GCK1) fails to clock registers on device


General Description:  

Functional and timing simulation pass, however registers clocked by Global Clock pin 1 (GCK1) do not toggle.


There is a bug in the iMPACT programming tool that prevents the proper programming of the GCK bit. As a result, registers connected to GCK1 are unresponsive on the device.  


This problem is fixed in the latest 5.2i Service Pack available at: 

The first service pack containing the fix is 5.2i Service Pack 1.

AR# 16140
Date Created 09/03/2007
Last Updated 05/08/2014
Status Archive
Type General Article