Well I did a search for ARM7TDMIE on the Ti website and it turns up associated with a Ti chip called the TMS470R1x. This looks like it probably fits the bill for what the IVA is (though I hasten to add this is just my assumption), along with some coprocessors to do the IVA specifics.

My attention was piqued by this doc: http://focus.ti.com/lit/an/spna071a/spna071a.pdf

The chip is described here: http://focus.ti.com/lit/ug/spnu134b/spnu134b.pdf

Then again, looking at this page (http://focus.ti.com/lit/ug/spnu248/spnu248.pdf) it looks like this chip has usually got peripherals attached to it (though it may still be used for the IVA as it's a know quantity for Ti, and it's about the only reference to that ARM chip I could find).

Though that doesn't really help in getting it to do anything of course, but always nice to know (or think we know) what's lurking in there.