SNDEX

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The DSi has extended the sound memory mapped I/O interface.


ARM7 IO REGISTERS

ADDRESS WIDTH (bytes) NAME
0x04004700 2 REG_SNDEXCNT


REG_SNDEXCNT
BIT DESCRIPTION
3-0 NITRO/DSP ratio, valid range is 0 to 8.
13 I2S frequency, 0=32.73 kHz, 1=47.61 kHz
14 Mute status

NITRO/DSP ratio

The DSP can generate sound output aswell, alongside the old NITRO sound mixer. The following settings configure the ratio between DSP and NITRO mixer output:

Setting Description
0 DSP sound 8/8, NITRO sound 0/8 (=DSP sound only)
1 DSP sound 7/8, NITRO sound 1/8
2 DSP sound 6/8, NITRO sound 2/8
3 DSP sound 5/8, NITRO sound 3/8
4 DSP sound 4/8, NITRO sound 4/8
5 DSP sound 3/8, NITRO sound 5/8
6 DSP sound 2/8, NITRO sound 6/8
7 DSP sound 1/8, NITRO sound 7/8
8 DSP sound 0/8, NITRO sound 8/8 (=NITRO sound only)
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