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How does DM8127 IPIPE module process the blank data

I want to use DM8127 IPIPE to capture bayer data.

The image from the sensor is (1920+500)*(1080+20)

I confuse one thing .

In the data sheet"TMS320DM814x Imaging Subsystem (ISS) User's Guide",page 572

reg: IPIPE->VAL,it says "The IPIPE module will process (VAL+1) lines".

I do not know the IPIPE module recv all the 1080+20 lines and just process (VAL+1) lines.

Or,the IPIPE module just recv the (VAL+1) lines.