Why do I see reconfiguration failure in Intel® Stratix® 10 devices when using the Temperature or Voltage Sensor Intel® Stratix® 10 FPGA IP?

During user mode, when asserting the nCONFIG pin low, you might observe unexpected behavior where nSTATUS stays high, which prevents the restarting of the configuration process for Intel® Stratix® 10 devices. This is due to an SDM mailbox flooding event using the Temperature or Voltage Sensor Intel Stratix 10 FPGA IP. A request to perform reconfiguration cannot interrupt the SDM process causing the configuration process to fail.

During normal user mode operation, to prevent the SDM mailbox flooding event, do the following :

1. In each Sensor IP, after issuing one request, wait for the response
2. After the response is received, wait for 1 second before issuing a new request

To perform reconfiguration:

1. Before asserting nCONFIG, disable each Sensor IP to prevent any sampling request to the Temperature or Voltage Intel Stratix 10 FPGA IP
2. Wait for at least 1 second
3. Assert nCONFIG to start the reconfiguration