I want to forward a ECU frame sync signal to my sensor.
My ECU uses a DS90UB954 and my sensor a DS90UB953.
I understand that I can forward one of four GPIO signals from the 954 to the 953 (e.g. for SPI). I also understand that there is an internal framesync generator in the 954.
But if I use an external frame sync signal coming in via a GPIO pin and going out as via GPIO pibn, why do I have to route this via a framesync signal as stated in https://e2e.ti.com/support/interface/f/138/t/907235 ?
Is there besides the GPIO backchannel transport also a framesync signal transport? Why should I use the latter before the primer?