CONF_DONE remains high during reconfiguration (Arria 10)

[mfransson]

We're experiencing an issue with Arria 10 where we can't reconfigure the device without power cycling. We're using passive serial single-device configuration and initial configuration always works.

However, on a configured device, when we pulse nCONFIG, nSTATUS goes low but CONF_DONE remains high. Also, nSTATUS is never released. The device is still operational (i.e. the old configuration is still there).

Looking at the state machine diagram at https://www.intel.com/content/www/us/en/programmable/documentation/sss1412661044400.html I don't see what we're missing. Pulling nCONFIG low should reset the state machine and both nCONFIG and CONF_DONE should go low. The nCONFIG pulse is longer than the 2 us specified in the A10 datasheet (tCFG).

[NurAiman_M_Intel]

Hi,

Thank you for contacting Intel community.

Does Quartus shows any error code/message? Please provide the screenshot.

Regards,

Aiman

[mfransson · Accepted solution]

We solved it. It turned out that we had chosen DCLK as the clock source for device initialization. Changing this (in our case to CLKUSR) solved the issue.

[NurAiman_M_Intel]

Hi,

Thank you for sharing the solution with Intel community.

I’m glad that your question has been addressed, I now transition this thread to community support. If you have a new question, feel free to open a new thread to get the support from Intel experts. Otherwise, the community users will continue to help you on this thread. Thank you.