Yamaha YMF724F specifications Cmd

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	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.

September 21, 1998

-32-