YMF724F
2-2-1. DSP Command
The following shows the list of DSP Commands that are supported by the SB Pro engine. Both SB and
SB Pro commands are supported.
CMD Support Function
10h
14h
16h
17h
1Ch
1Fh
20h(*1)
24h(*1)
2Ch(*1)
30h
31h
34h
35h
36h(*2)
37h(*2)
38h
40h
48h
74h
75h
76h
77h
7Dh
7Fh
80h
90h
o
o
8bit direct mode single byte digitized sound output
8bit single-cycle DMA mode digitized sound output
8bit to 2bit ADPCM single-cycle DMA mode digitized sound output
8bit to 2bit ADPCM single-cycle DMA mode digitized sound output with ref. byte
8bit auto-init DMA mode digitized sound output
8bit to 2bit ADPCM auto-init DMA mode digitized sound output with ref. byte
8bit direct mode single byte digitized sound input
8bit single-cycle DMA mode digitized sound input
8bit auto-init DMA mode digitized sound input
Polling mode MIDI input
o
o
o
o
o
o
o
o
o
o
o
o
o
o
o
Interrupt mode MIDI input
UART polling mode MIDI I/O
UART interrupt mode MIDI I/O
UART polling mode MIDI I/O with time stamping
UART interrupt mode MIDI I/O with time stamping
MIDI output
Set digitized sound transfer Time Constant
Set DSP block transfer size
8bit to 4bit ADPCM single-cycle DMA mode digitized sound output
8bit to 4bit ADPCM single-cycle DMA mode digitized sound output with ref. byte
8bit to 3bit ADPCM single-cycle DAM mode digitized sound output
8bit to 3bit ADPCM single-cycle DMA mode digitized sound output with ref. byte
8bit to 4bit ADPCM auto-init DMA mode digitized sound output with ref. byte
8bit to 3bit ADPCM auto-init DMA mode digitized sound output with ref. byte
Pause DAC for a duration
8bit high-speed auto-init DMA mode digitized sound output
8bit high-speed single-cycle DMA mode digitized sound output
8bit high-speed auto-init DMA mode digitized sound input
8bit high-speed single-cycle DMA mode digitized sound input
Set input mode to mono
Set input mode to stereo
Pause 8bit DMA mode digitized sound I/O
Turn on speaker
Turn off speaker
Continue 8bit DMA mode digitized sound I/O
Get speaker status
Exit 8bit auto-init DMA mode digitized sound I/O
Get DSP version number
o
o
o
o
o
o
o
o
o
o
o
o
o
o
o
91h
98h(*1)
99h(*1)
A0h(*1)
A8h(*1)
D0h
D1h(*3)
D3h(*3)
D4h
D8h
DAh
E1h
Note:
(*1) The SB Block responds correctly to the commands for recording and also executes the DMA transfer.
80h is always transferred.
(*2) Only output is supported for this command.
(*3) This command only changes Speaker Status (D8h).
Undocumented commands other than the ones listed above are also supported.
January 14, 1999
-32-
YAMAHA [ YAMAHA CORPORATION ]
