APU register table/DSP voice: Difference between revisions
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(Took the table from the S-SMP page, updated to match MMIO_register_table, added different register names and links) |
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| Reads signed 8-bit value of current sample wave multiplied by ENVX, before applying VOL. | | Reads signed 8-bit value of current sample wave multiplied by ENVX, before applying VOL. | ||
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Revision as of 08:53, 1 November 2024
See: APU register table
This table lists the 2 common names for the S-DSP voice registers.
| Name | Address | Bits | Type | Notes | |
|---|---|---|---|---|---|
| VxVOLL | VOL (L) | $X0 | SVVV VVVV | RW | Left channel volume, signed. |
| VxVOLR | VOL (R) | $X1 | SVVV VVVV | RW | Right channel volume, signed. |
| VxPITCHL | P (L) | $X2 | LLLL LLLL | RW | Low 8 bits of sample pitch. |
| VxPITCHH | P (H) | $X3 | --HH HHHH | RW | High 6 bits of sample pitch. |
| VxSCRN | SCRN | $X4 | SSSS SSSS | RW | Selects a sample source entry from the directory (see DIR below). |
| VxADSR1 | ADSR (1) | $X5 | EDDD AAAA | RW | ADSR enable (E), decay rate (D), attack rate (A). |
| VxADSR2 | ADSR (2) | $X6 | SSSR RRRR | RW | Sustain level (S), sustain rate (R). |
| VxGAIN | GAIN | $X7 | 0VVV VVVV 1MMV VVVV |
RW | Mode (M), value (V). |
| VxENVX | ENVX | $X8 | 0VVV VVVV | R | Reads current 7-bit value of ADSR/GAIN envelope. |
| VxOUTX | OUTX | $X9 | SVVV VVVV | R | Reads signed 8-bit value of current sample wave multiplied by ENVX, before applying VOL.
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