DSP

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)

DMA

This section is very incomplete and not much was tested on hardware either

Sample formats:

• 0x0 = 8 bit
• 0x1 = 16 bit
• 0x2 = 24 bit in MSB
• 0x3 = 32 bit
• 0x4
• 0x5
• 0x6 = 24 bit in LSB (also endianess switched?^{[citation needed]})
• 0x7

Buffers:

• 0x0 = FIFO0
• 0x1 = FIFO1
• 0x2 = FIFO2^{[citation needed]}
• 0x3 = FIFO3^{[citation needed]}
• 0x4
• 0x5
• 0x6
• 0x7
• 0x8
• 0x9
• 0xA
• 0xB
• 0xC
• 0xD
• 0xE = Circular
• 0xF

Related links

• Modernized fork of a56, open-source assembler for the similar 56000 architecture