The tear down reports and other analysis out there show pretty clearly that the CXD2973GB and the CXD4302GB are an IO Controller and the Super Companion Chip IO controller.
The scaling in the PDF you show, within the controller, are going to be completely minimal, without any advanced logic.
I think everyone is on a wild goose chase looking for a hardware chip for scaling on the PS3.
It's starting to look like there is no hardware scaler, but that Sony are developing a library that runs on a Cell processor, which the SDK will access.
If Sony REALLY had a hardware scaler, they would have come right and said "WE HAVE A HARDWARE SCALER. LOOK, THERE IT IS..." But instead they've just released a little SDK and kinda nudged a couple people and winked at it...
I think that they released it for PR
value. If they really had a hardware scaler, then shouldn't they concentrate on USING it in their own DVD software to give users proper DVD upscaling, instead of worrying about releasing a SDK for developers to use a "half" a scaler?
If a developer thinks that they will get a full SDK for a whole scaler, why would they waste time developing on the "half-scaler"?
I think Sony needs to get the DVD software working before they drop hints for other people to make noise about a hardware scaler which doesn't exist.