YMF754-R datasheet(36/60 Pages) YAMAHA

36 / 60 page

YMF754

June 28, 1999

-36-

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

8bit direct mode single byte digitized sound output

14h

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

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)

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

Polling mode MIDI input

31h

Interrupt mode MIDI input

34h

UART polling mode MIDI I/O

35h

UART interrupt mode MIDI I/O

36h(*2)

UART polling mode MIDI I/O with time stamping

37h(*2)

UART interrupt mode MIDI I/O with time stamping

38h

MIDI output

40h

Set digitized sound transfer Time Constant

48h

Set DSP block transfer size

74h

8bit to 4bit ADPCM single-cycle DMA mode digitized sound output

75h

8bit to 4bit ADPCM single-cycle DMA mode digitized sound output with ref. byte

76h

8bit to 3bit ADPCM single-cycle DMA mode digitized sound output

77h

8bit to 3bit ADPCM single-cycle DMA mode digitized sound output with ref. byte

7Dh

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

Pause DAC for a duration

90h

8bit high-speed auto-init DMA mode digitized sound output

91h

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

Pause 8bit DMA mode digitized sound I/O

D1h(*3)

Turn on speaker

D3h(*3)

Turn off speaker

D4h

Continue 8bit DMA mode digitized sound I/O

D8h

Get speaker status

DAh

Exit 8bit auto-init DMA mode digitized sound I/O

E1h

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.

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