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DS90UB960-Q1: query for sending a gpio input of des to several ser IC

Part Number: DS90UB960-Q1

Hi Ti, 

I saw figure 29. internal frame sync in 960 datasheet. 

this figure shows 4 input ser-camera to des IC. 

I wonder :

q1) when I use internal frame sync in 960 des, is it possible below use-case ? 

- 1st and 2nd input of des follows internal frame sync 

- and 3rd, 4th input of des follows external frame sync (or 'using input-gpio of des, and send it to 3rd, 4th ser' GPIO output) 

q2) for different image resolution and hz, (1.2M@30hz *2ea + 2M@30hz *2ea + 1.5M@60hz *2ea) 

how can I make frame-sync system ? is there any, practical example for this ? 

thanks