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short field frame and long field frame for DM648 VP0

Hi:

    We're debugging the DM648 custom board, use the CCS3.3, bios5.31.02 and pspdriver_1_10_00_09, the video input through the VP0, while a short field frame is captured, the vp0 will send an interrupt to the cpu. Now my question is what will the cpu do if it receive the interrupt, and the calling Fvid_exchange() in the application program will have something different  if the short field was captured by the driver?  thank you!