During the first configuration, after SYNC word is detected, configuration logic checks for illegal packets on several fields:
OPCODE (i.e., op-code=11(reserved)),
Register address out of range
Bad packet type (only type-1, type-2 are legal).
It flags any illegal values as a "Bad packet error" in the Status Register. Once a "Bad packet error" is flagged, configuration logic loads no further data, but INIT is not pulled Low as this is not a CRC error.