YMF715E Datasheet, PDF (27/54 Pages) YAMAHA CORPORATION – OPL3 Single-chip Audio System 3

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ɹ9-1-2-1. DSP Command
Listed below are the supported commands of DSP defined Sound Blaster Pro compatibility.
CMD Support Function
10h
o 8bit direct mode digitized sound I/O output
14h
o 8bit single-cycle DMA mode digitized sound output
16h
*1 8bit to 2bit ADPCM single-cycle DMA mode digitized sound output
17h
*1 8bit to 2bit ADPCM single-cycle DMA mode digitized sound output with ref. byte
1Ch
o 8bit auto-init DMA mode digitized sound output
1Fh
*1 8bit to 2bit ADPCM auto-init DMA mode digitized sound output with ref. byte
20h
*1 8bit direct mode single byte digitized sound input
24h
*1 8bit single-cycle DMA mode digitized sound input
2Ch
*1 8bit auto-init DMA mode digitized sound input
30h
o Polling mode MIDI input
31h
o Interrupt mode MIDI input
34h
o UART polling mode MIDI I/O
35h
o UART interrupt mode MIDI I/O
36h o(*2) UART polling mode MIDI I/O with time stamping
37h o(*2) UART interrupt mode MIDI I/O with time stamping
38h
o MIDI output
40h
o Set digitized sound transfer Time Constant
48h
o Set DSP block transfer size
74h
o 8bit to 4bit ADPCM single-cycle DMA mode digitized sound output
75h
o 8bit to 4bit ADPCM single-cycle DMA mode digitized sound output with ref. byte
76h
*1 8bit to 3bit ADPCM single-cycle DAM mode digitized sound output
77h
*1 8bit to 3bit ADPCM single-cycle DMA mode digitized sound output with ref. byte
7Dh
o 8bit to 4bit ADPCM auto-init DMA mode digitized sound output with ref. byte
7Fh
*1 8bit to 3bit ADPCM auto-init DMA mode digitized sound output with ref. byte
80h
o Pause DAC for a duration
90h
o 8bit high-speed auto-init DMA mode digitized sound output
91h
o 8bit high-speed single-cycle DMA mode digitized sound output
98h
*1 8bit high-speed auto-init DMA mode digitized sound input
99h
*1 8bit high-speed single-cycle DMA mode digitized sound input
A0h
*1 Set input mode to mono
A8h
*1 Set input mode to stereo
D0h
o Pause 8bit DMA mode digitized sound I/O
D1h
*1 Turn on speaker
D3h
*1 Turn off speaker
D4h
o Continue 8bit DMA mode digitized sound I/O
D8h
*1 Get speaker status
DAh
o Exit 8bit auto-init DMA mode digitized sound I/O
E1h
o Get DSP version number
Note :
*1) These commands are performed in state-machine, but they are not effective.
*2) MIDI data can not be received.
Additional undocumented commands are included.
May 21, 1997
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