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AR# 39837: BPI Configuration & iMPACT Indirect BPI Programming - Potential conflict between Vref and BPI address pin
BPI Configuration & iMPACT Indirect BPI Programming - Potential conflict between Vref and BPI address pin
For some FPGA devices BPI configuration address pins can also be used as VREF pins in normal operation. When using a flash density that does not utilize all of the address pins, can I connect the BPI Address pins as VREF?
During configuration, the address pins will always drive in BPI mode. Also, during Indirect BPI programming, all address bits will be driven. This causes contention on the board if a Vref supply is connected to these address bits. For that reason, these dual purpose pins should not be used as VREF if the device is configured via BPI.