Can't scan JTAG chain

Hi Daixiwen,

Thank you for the response.

1. The FPGA works perfectly when I use the EPCS4 device for configuration.

2. The Max connector is also facing the same problem: Can't access JTAG chain.

3. I am sure of the JTAG connection.

4. When I press auto-detect, I am observing a clock on TCK for around 65ms. Only for this duration, the TMS line goes low, and the TDO line goes high. At other times, TMS is high and TDO is low. The TDI signal goes low for around 5ms immediately after the 65ms interval. TDI is high at all other times.

Can you please see what may be the issue.

regards,

rajesh