DSP
From xboxdevwiki
The DSPs in the APU are probably "Parthus MediaStream" DSP core (DSP24210/DSP2420?).
Those are similar to Motorola DSP56362 (DSP56300 Family). If so, the datasheet can be found at http://www.nxp.com/docs/en/data-sheet/DSP56362.pdf (Also see "Documentation" section in said datasheet for the related documentation)
According to espes, the DMA stuff is different.
