Creative SB0350 Hardware Programming Guide - Page 94

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DSP Commands 6-9 1Fh Output Remarks 1Fh Creative 8-bit to 2-bit ADPCM auto-init DMA mode digitized sound output with reference byte Output digitized sound data compressed with Creative 8-bit to 2-bit ADPCM using auto-init DMA mode. Refer to command 1Ch on how to terminate an auto-init transfer. If the transfer is terminated by programming the last block to single-cycle DMA mode digitized sound I/O, the last block must be programmed with the no reference byte command, 16h. See Also command 16h, Creative 8-bit to 2-bit ADPCM single-cycle DMA mode digitized sound output command DAh, Exit 8-bit auto-init DMA mode digitized sound I/O 1.xx 2.00 9 2.01+ 9 3.xx 9 4.xx 9 Available 20h Output Remarks 20h 8-bit direct mode single byte digitized sound input Input one byte of unsigned digitized sound data from the DSP. The application is responsible for controlling the sampling rate. The proper transfer sequence is: 1. 2. 3. Send command 20h. Read a byte of digitized sound data from the DSP. Wait for the correct timing and repeat steps 1 and 2 until the end of recording. See Also Available command 10h, 8-bit direct mode single byte digitized sound output 1.xx 9 2.00 9 2.01+ 9 3.xx 9 4.xx 9

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DSP Commands
6-9
1Fh
Creative 8-bit to 2-bit ADPCM auto-init DMA mode
digitized sound output with reference byte
Output
1Fh
Remarks
Output digitized sound data compressed with Creative 8-bit to 2-bit ADPCM using
auto-init DMA mode.
Refer to command
1Ch
on how to terminate an auto-init transfer.
If the transfer is
terminated by programming the last block to single-cycle DMA mode digitized
sound I/O, the last block must be programmed with the no
reference byte
command,
16h
.
See Also
command
16h
, Creative 8-bit to 2-bit ADPCM single-cycle DMA mode digitized
sound output
command
DAh
, Exit 8-bit auto-init DMA mode digitized sound I/O
Available
1.xx
2.00
2.01+
3.xx
4.xx
9
9
9
9
20h
8-bit direct mode single byte digitized sound input
Output
20h
Remarks
Input one byte of unsigned digitized sound data from the DSP.
The application is
responsible for controlling the sampling rate.
The proper transfer sequence is:
1.
Send command 20h.
2.
Read a byte of digitized sound data from the DSP.
3.
Wait for the correct timing and repeat steps 1 and 2 until the end of recording.
See Also
command
10h
, 8-bit direct mode single byte digitized sound output
Available
1.xx
2.00
2.01+
3.xx
4.xx
9
9
9
9
9