ZHCSJH7 March 2019 DS90UB940N-Q1
PRODUCTION DATA.
The AEQ circuit can be restarted at any time by setting the AEQ_RESTART bit in the AEQ_CTL1 register 0x35. When the deserializer is powered on, the AEQ will continually search through EQ settings and could be at any setting when the signal is supplied from the serializer. If the Rx Port CDR locks to the signal, it may be good enough for low bit errors, but it could also not be optimized or over-equalized. For a consistent initial EQ setting, TI recommends that the user applies either AEQ_RESTART or DIGITAL_RESET0 when the serializer input signal frequency is stable to restart adaption from the minimum EQ gain value.