Sound; Sound Block Diagram - Nintendo 1504166 - Game Boy Advance SP Edition Console Programming Manual

AGB Programming Manual

10 Sound

In addition to 4 channels of CGB-compatible sound, AGB has 2 channels of direct sound.
1. Direct Sounds A and B
Provides playback of linear 8-bit audio data.
Uses the timer and DMA.
2. Sound 1
Allows generation of rectangular waveforms with sweep (frequency change) and envelope
(volume change) functions.
3. Sound 2
Allows generation of rectangular waveforms with envelope functions.
4. Sound 3
Allows playback of any waveform recorded in waveform RAM.
Waveform RAM in AGB has double the capacity of that in CGB.
5. Sound 4
Can generate white noise with the envelope function.
The synthesis ratio of sounds 1-4 to direct sound can be specified.

10.1 Sound Block Diagram

Sound 1
Sound 2
Sound 3
Sound 4
Direct Sound A
DMA1
Direct Sound B
DMA2
©1999 - 2001 Nintendo of America Inc.
4 9bit
R/L
4 9bit
Selection
&
4 9bit
Addition
4 9bit
FIFO A
8 9bit
(8 Words)
FIFO B
8 9bit
(8 Words)
84
1-Fold
/
2-Fold
/
4-Fold
R/L
Selection
&
Addition
1-Fold/2-Fold
1-Fold/2-Fold
D.C.N. AGB-06-0001-002B4
Sound