If MCU at Deseralizer wants to check line status, they could use alternative ways (could be one of them) such as:
- check status of LOCK by MCU at MAX9278 (If line is broken or short, LOCK might fail).
- check UART if communication with SOC at Serializer is OK
- use GPI/GPO or CNTL pin to transfer event to Serializer and check if SOC at Serializer could send ACK to MCU at Deserializer