Nintendo 1504166 Programming Manual - Page 84
Sound, 10.1 Sound Block Diagram, Direct Sounds A and B, Sound 1
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AGB Programming Manual Sound 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 4 → 9bit 4 → 9bit 4 → 9bit 4 → 9bit Direct Sound A DMA1 FIFO A (8 Words) Direct Sound B DMA2 FIFO B (8 Words) R/L Selection & Addition 1-Fold / 2-Fold / 4-Fold 8 → 9bit 1-Fold/2-Fold R/L Selection & Addition 8 → 9bit 1-Fold/2-Fold ©1999 - 2001 Nintendo of America Inc. 84 D.C.N. AGB-06-0001-002B4