9.3. Hot-Socketing Feature Implementation
The hot-socketing circuit does not include the CONF_DONE, nCEO, and nSTATUS pins to ensure that these pins are able to operate during configuration. Thus, its is an expected behavior for these pins to drive out during power-up and power-down sequences.
Intel® uses GND as reference for hot-socketing operation and I/O buffer designs. To ensure proper operation, Intel® recommends connecting the GND between boards before connecting the power supplies. This prevents the GND on your board from being pulled up inadvertently by a path to power through other components on your board. A pulled up GND can cause an out-of-specification I/O voltage or current condition with the Intel® FPGA.
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