YMF740C Datasheet, PDF (28/44 Pages) List of Unclassifed Manufacturers – DS-1L

YMF740C
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
o 8bit direct mode single byte digitized sound output
14h
o 8bit single-cycle DMA mode digitized sound output
16h
8bit to 2bit ADPCM single-cycle DMA mode digitized sound output
17h
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
8bit to 2bit ADPCM auto-init DMA mode digitized sound output with ref. byte
20h(*1) o 8bit direct mode single byte digitized sound input
24h(*1) o 8bit single-cycle DMA mode digitized sound input
2Ch(*1) o 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(*2) o UART polling mode MIDI I/O with time stamping
37h(*2) o 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
8bit to 3bit ADPCM single-cycle DAM mode digitized sound output
77h
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
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) o 8bit high-speed auto-init DMA mode digitized sound input
99h(*1) o 8bit high-speed single-cycle DMA mode digitized sound input
A0h(*1) o Set input mode to mono
A8h(*1) o Set input mode to stereo
D0h
o Pause 8bit DMA mode digitized sound I/O
D1h(*3) o Turn on speaker
D3h(*3) o Turn off speaker
D4h
o Continue 8bit DMA mode digitized sound I/O
D8h
o Get speaker status
DAh
o Exit 8bit auto-init DMA mode digitized sound I/O
E1h
o Get DSP version number
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
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