Error: Can't access JTAG chain

Hi @Aravindpb​

The issue may be due to

1. JTAG header pins. Check your jtag header pins for ground short or misplacing it.
2. Power supply. check the power supplies and its connection are following the recommended values as stated in the respective device handbook.
3. pull-up & pull-down connected to the JTAG pins are following the recommended values as stated in the respective device handbook.

Check the link which address the issue

https://www.intel.com/content/www/us/en/programmable/support/support-resources/knowledge-base/solutions/rd03312011_647.html

Let me know if this has helped resolve the issue you are facing or if you need any further assistance.

Best Regards,

Anand