Creative SB0350 Hardware Programming Guide - Page 108

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DSP Commands 6-23 Bxh Output Remarks Program 16-bit DMA mode digitized sound I/O bCommand, bMode, wLength.LowByte, wLength.HighByte The bCommand byte is organized as: D7 1 D6 0 D5 1 D4 1 D3 A/D 0 = D/A 1 = A/D D2 Auto-Init 0 = SC 1 = AI D1 FIFO 0 = off 1 = on D0 0 where D/A stands for digital-to-analog, A/D for analog-to-digital, SC for single-cycle DMA mode, AI for auto-init DMA mode. FIFO will be re-initialized when the DSP receives any new digitized sound I/O commands. The bMode byte is organized as: D7 0 D6 0 D5 stereo 0 = mono 1 = stereo D4 signed 0 = unsigned 1 = signed D3 0 D2 0 D1 0 D0 0 where the signed bit determines whether the data is signed or unsigned. For minimum signal amplitude, the signed 16-bit value is 0000h; with unsigned data, the equivalent value is 8000h. wLength is a word giving the number of 16-bit samples less 1. Refer to command 1Ch on how to terminate auto-init DMA mode. See Also command D5h, Pause 16-bit DMA mode digitized sound I/O command D6h, Continue 16-bit DMA mode digitized sound I/O command D9h, Exit 16-bit auto-init DMA mode digitized sound I/O 1.xx 2.00 2.01+ 3.xx 4.xx 9 Available

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DSP Commands
6-23
B
x
h
Program 16-bit DMA mode digitized sound I/O
Output
bCommand, bMode, wLength.LowByte, wLength.HighByte
Remarks
The
bCommand
byte is organized as:
D7
D6
D5
D4
D3
D2
D1
D0
1
0
1
1
A/D
Auto-Init
FIFO
0
0 = D/A
0 = SC
0 = off
1 = A/D
1 = AI
1 = on
where
D/A
stands for digital-to-analog,
A/D
for analog-to-digital,
SC
for single-cycle DMA mode,
AI
for auto-init DMA mode.
FIFO will be re-initialized when the DSP receives any new digitized sound I/O
commands.
The
bMode
byte is organized as:
D7
D6
D5
D4
D3
D2
D1
D0
0
0
stereo
signed
0
0
0
0
0 = mono
0 = unsigned
1 = stereo
1 = signed
where the
signed
bit determines whether the data is signed or unsigned.
For
minimum signal amplitude, the signed 16-bit value is 0000h; with unsigned data, the
equivalent value is 8000h.
wLength
is a word giving the number of 16-bit samples less 1.
Refer to command
1Ch
on how to terminate auto-init DMA mode.
See Also
command
D5h
, Pause 16-bit DMA mode digitized sound I/O
command
D6h
, Continue 16-bit DMA mode digitized sound I/O
command
D9h
,
Exit 16-bit auto-init DMA mode digitized sound I/O
Available
1.xx
2.00
2.01+
3.xx
4.xx
9