Registers #
| Old3DS | Name | Physical Address | Width | Used by |
|---|---|---|---|---|
| Yes | DSP_PDATA | 0x10203000 | 2 | |
| Yes | DSP_PADR | 0x10203004 | 2 | |
| Yes | DSP_PCFG | 0x10203008 | 2 | |
| Yes | DSP_PSTS | 0x1020300C | 2 | |
| Yes | DSP_PSEM | 0x10203010 | 2 | |
| Yes | DSP_PMASK | 0x10203014 | 2 | |
| Yes | DSP_PCLEAR | 0x10203018 | 2 | |
| Yes | DSP_SEM | 0x1020301C | 2 | |
| Yes | DSP_CMD0 | 0x10203020 | 2 | |
| Yes | DSP_REP0 | 0x10203024 | 2 | |
| Yes | DSP_CMD1 | 0x10203028 | 2 | |
| Yes | DSP_REP1 | 0x1020302C | 2 | |
| Yes | DSP_CMD2 | 0x10203030 | 2 | |
| Yes | DSP_REP2 | 0x10203034 | 2 |
DSP_PDATA #
Data (one stage of the 16-stage Read FIFO).
DSP_PADR #
Lower 16bit of Address in DSP Memory. Note: The upper 16bit of Address must be configued in the DMA register (inside of the DSP).
DSP_PCFG - DSP Configuration (R/W) (16bit) #
| Bits | Description |
|---|---|
| 0 | DSP Reset (0=Release, 1=Reset) ;should be held “1” for 8 DSP clks |
| 1 | Address Auto-Increment (0=Off, 1=On) |
| 2-3 | DSP Read Data Length (0=1 word, 1=8 words, 2=16 words, 3=Free-Run) |
| 4 | DSP Read Start Flag (mem transfer via Read FIFO) (1=Start) |
| 5 | Interrupt Enable Read FIFO Full (0=Off, 1=On) |
| 6 | Interrupt Enable Read FIFO Not-Empty (0=Off, 1=On) |
| 7 | Interrupt Enable Write FIFO Full (0=Off, 1=On) |
| 8 | Interrupt Enable Write FIFO Empty (0=Off, 1=On) |
| 9 | Interrupt Enable Reply Register 0 (0=Off, 1=On) |
| 10 | Interrupt Enable Reply Register 1 (0=Off, 1=On) |
| 11 | Interrupt Enable Reply Register 2 (0=Off, 1=On) |
| 12-15 | DSP Memory Transfer (0=Data Memory, 1=MMIO Register, 5=Program Memory) |
DSP_PSTS #
| Bits | Description |
|---|---|
| 0 | Read Transfer Underway Flag (0=No, 1=Yes/From DSP Memory) |
| 1 | Write Transfer Underway Flag (0=No, 1=Yes/To DSP Memory) |
| 2 | Peripheral Reset Flag (0=No/Ready, 1=Reset/Busy) |
| 3-4 | Unused |
| 5 | Read FIFO Full Flag (0=No, 1=Yes) |
| 6 | Read FIFO Not-Empty Flag (0=No, 1=Yes) ;ARM11 may read DSP_PDATA |
| 7 | Write FIFO Full Flag (0=No, 1=Yes) |
| 8 | Write FIFO Empty Flag (0=No, 1=Yes) |
| 9 | Semaphore IRQ Flag (0=None, 1=IRQ) |
| 10 | Reply Register 0 Update Flag (0=Was Written by DSP, 1=No) |
| 11 | Reply Register 1 Update Flag (0=Was Written by DSP, 1=No) |
| 12 | Reply Register 2 Update Flag (0=Was Written by DSP, 1=No) |
| 13 | Command Register 0 Read Flag (0=Was Read by DSP, 1=No) |
| 14 | Command Register 1 Read Flag (0=Was Read by DSP, 1=No) |
| 15 | Command Register 2 Read Flag (0=Was Read by DSP, 1=No) |
Unknown if/when bit10-15 get reset… maybe after reading the status?
DSP_PSEM #
DSP-to-ARM11 Semaphore 0..15 Flags (0=Off, 1=On). Reportedly these flags are sent in ARM11-to-DSP direction. Confusingly, the other DSP_Pxxx registers are for opposite direction?
DSP_PMASK #
DSP-to-ARM11 Semaphore 0..15 Interrupt Disable (0=Enable, 1=Disable)
DSP_PCLEAR #
DSP-to-ARM11 Semaphore 0..15 Clear (0=No Change, 1=Clear). Reportedly clears bits in DSP_PSEM. [that’s probably nonsense, clearing bits in DSP_SEM would make more sense]
DSP_SEM #
DSP-to-ARM11 Semaphore 0..15 Flags (0=Off, 1=On). Reportedly these flags are received in DSP-to-ARM11 direction.
DSP_CMDX #
Command/Data to DSP.
DSP_REPX #
Reply/Data from DSP.