DSP Commands
6-23
Bxh
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
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