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We intend to use this mostly for HD component video input. We are planning on not connecting a DDR2 memory chip and do not feel we need the 3D-COMB filter. We have the following questions that I hope someone can help with:

1) Is the functionality I am not enabling limited to SD video or does the video processing enabled by the DDR2 memory also affect HD video?

2) I understand that I am only missing out of the 3D-COMB filter, but that the 2D filtering still would work. Is this correct?

3) What should I do with the unused pins that would otherwise have connected the DDR2 chip. Do I simply not connect them and let them float? Should I connect all inputs to ground? Or something else?