The deserializer may set the video pass criteria via register 0x7D and determine whether valid video has been received through register 0x4D bit1. This document takes “0x7D set to 0x33” as an example (video pass is set to 1 after the deserializer receives stable resolution images and 3 frames of data).

board.WriteI2C(DesAddr,0x4c,0x01/12/24/38) # Select RX0/1/2/3

board.WriteI2C(DesAddr,0x7D,0x33) # disable watchdog and set pass threshold

check if 0x4D bit 1 is 1 and determine if video pass