Capturing ProRes 422 with Black Magic Decklink HD

Using Final Cut Pro 7 and I may be blind, but I've looked and looked and can't find a way to capture my 720P60 video via Decklink HD to anything other than ProRes HQ. I don't want HQ, my entire workflow is ProRes 422. I've tried altering the capture settings from within FCP but all I get is a black screen in the capture window. Is this just a Black Magic limitation or am I missing something?

Herb Sevush
Zebra Productions
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nothin' attached to nothin'
"Deciding the spine is the process of editing" F. Bieberkopf