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I had reset related questions on of the DS90UB951 or any of the TI serializer components. As I understand it:
A reset of the DS90UB951/953 component can be initiated with I2C writes over the back channel (full reset or reset of logic that are not registers).
In addition, the PDB input can be used to reset the component.
In our application, the serializer and deserializer or on different boards and the only communication is through the FPD LinkIII
My questions are
1) If I2C back channel is down or non responsive, does that imply the back channel is down and GPIO communication would not be present on the FPD-LinkIII either?
2) Would there be any value in connecting one of the GPIO outputs of the serializer to the serializer PDB pin?
If something is hung in the TI serializer, (say the I2C logic) and I want to reset the serializer, does it make any sense to assert a reset via a GPIO from the host to the deserializer and propagate the reset to the serializer itself? Assume I had some other reset circuitry to take the serializer GPIO output (host reset) and initiate the proper power up/down sequence on the serializer itself. Is that legal?
