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DS90UB927Q-Q1: DS90UB927Q-Q1 communication with DS90UB940
Hello，first,the DS90UB940-Q1 is also backward-compatible with the DS90UB925Q-Q1, DS90UB925AQ-Q1, and DS90UB927Q-Q1 for PCLK frequencies ranging from 25 MHz to 85 MHz. Backward compatibility does not need to be enabled. When paired with a backward-compatible device, the deserializer auto-detects to 1-lane FPD-LinkIII on the primary channel (RIN0±).
As to the BKWD pin of DS90UB927, because 927 didn't need to be back compatible, it should be configured BKWD=0.
If BKWD=1 it means that 927 interfaces with 906/916.
