CMI-8738 Datasheet, PDF (9/28 Pages) C-Media Electronics – C3DX PCI-Based HRTF 3D Extension Positional Audio Chip

Ver. 1.2
CMI-8738/PCI-SX AUDIO Specification
101
110
111
9-6
Reserved
5
INTRM
4
BREQ
from accessing the memory.
3
VOICE_EN
2
UART_EN
1
JYSTK_EN
0
16 K
32 K
48 K
Interrupt Mask bit for MCB (Master control block) module interrupt.
0 MCB interrupt disabled.
1 MCB interrupt enabled.
If this bit is set low it will prevent the MCB and DAC/ADC block
0 Bus Master request disabled(power on state)
1 Bus Master request enabled.
This bit enables Legacy Voice device(SB16,FM).
0 Legacy Voice disabled on channel 0.
1 Legacy Voice enabled on channel 0.
This bit enables Legacy UART device.
0 UART disabled
1 UART enabled
This bit enables Legacy Joystick device.
0 Joystick disabled
1 Joystick enabled
Reserved
Channel Format Register
Address 08H
Bit(s) R/W
Name
Description
31-24
VER[7:0]
PCI Audio subversion for internal indentification. “01”
23-19
Reserved
18
FMOFFSET2 When set 1 and Reg. 24H bit7 ‘FMmute=1’,FM PCM will be forced
to DC value 0002H.
17-16
Reserved
15-14
AdcBitLen[1:0] Sample resolution
00
16 Bits per sample . (Default)
01
15 Bits per sample.
10
14 Bits per sample.
11
13 Bits per sample.
13-12
AdcDacLen[1:0] Sample resolution
00
600nSec per bit in a sample.
01
660nSec per bit in a sample.
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