SNLS589B September 2016 – July 2018 DS90UB960-Q1
A frame synchronization signal (FrameSync) can be sent through the back channel using any of the back channel GPIOs. The signal can be generated in two different methods. The first option offers sending the external FrameSync using one of the available GPIO pins on the DS90UB960-Q1 and mapping that GPIO to a back channel GPIO on one or more of the FPD-Link III ports.
The second option is to have the DS90UB960-Q1 internally generate a FrameSync signal to send through GPIO to one or more of the attached Serializers.
FrameSync signaling on the four back channels is synchronous. Thus, the FrameSync signal arrives at each of the four serializers with limited skew.