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Solution ID: rd07102008_776
Last Modified: Aug 05, 2008
Product Category: Devices
Product Area: Configuration
Product Sub-area: JTAG
Problem
Why do I receive an error message “Can’t access JTAG chain” when I configure a Cyclone III device in an EQFP E144 package?
Solution
You may receive an error message “Can’t access JTAG chain” when you configure Cyclone® III devices in an EQFP E144 package. This is because all E144 packages have an exposed pad at the bottom of the package. This exposed pad represents the ground pad that must be connected to the ground plane on your PCB. This exposed pad is used for electrical connectivity and not for thermal purposes. Failing to solder the exposed pad to ground will cause the device to hold in a reset state and all types of configuration modes will fail.
Feedback
Altera does not warrant that this solution will work for the customer's intended purpose and disclaims all liability for use of or reliance on the solution.
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