<Error message>
Error: JTAG chain problem detected
Error: he TDI connection to the first device 5CSxxx/.. might be to VCC or is an open circuit
Error: The TCLK and TMS connections to the device before the first detected device 5CSxxx/.. might have a problem

Category: Programming/Configuration
Tools: Quartus® Prime
Device: Cyclone® V


When I assert HPS_nRST and HPS_nPOR on the Hard Processor System (HPS) side pins, the JTAG chain is not enabled.

Reference information
Why is my JTAG chain broken when the HPS_nRST or HPS_nPOR signal is asserted?
https://www.altera.com/support/support-resources/knowledge-base/solutions/rd08122013_684.html