extract only even lines from interlacer

Hello,

I have not tested this but the user guide seems to imply that the behaviour of the interlacer can be overriden under specific conditions. You need to:

1) turn on "Control packets override field selection"

2) modify the control packets on the fly and change the interlace nibble to 0000 or 0001 to select the field you want to keep

You need to write your own HDL for 2) but this seems fairly straightforward.