Nintendo 1504166 Programming Manual - Page 86
Direct Sound Execution, If the DMA channel receiving the request is in sound FIFO transfer mode
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AGB Programming Manual Sound With the preceding preparations, direct sound is executed as follows. Direct Sound Execution 1. When the specified timer overflows due to a count up, the audio data are passed from the FIFO to the sound circuit. 2. If 4 words of data remain in the FIFO as the transfer count progresses, the FIFOs for direct sounds A and B output a data transfer request to the specified DMA channel. 3. If the DMA channel receiving the request is in sound FIFO transfer mode, 4 words of data are provided to the sound FIFO (the DMA WORD COUNT is ignored). The preceding is repeated starting from 1. ©1999 - 2001 Nintendo of America Inc. 86 D.C.N. AGB-06-0001-002B4
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AGB Programming Manual
Sound
©1999 - 2001 Nintendo of America Inc.
86
D.C.N. AGB-06-0001-002B4
With the preceding preparations, direct sound is executed as follows.
Direct Sound Execution
1.
When the specified timer overflows due to a count up, the audio data are passed
from the FIFO to the sound circuit.
2.
If 4 words of data remain in the FIFO as the transfer count progresses, the FIFOs
for direct sounds A and B output a data transfer request to the specified DMA
channel.
3.
If the DMA channel receiving the request is in sound FIFO transfer mode, 4
words
of data are provided to the sound FIFO (the DMA WORD COUNT is
ignored).
The preceding is repeated starting from 1.