CMI8738-MX Datasheet, PDF (14/32 Pages) C-Media Electronics – PCI-6CH C3DX series /PCI-Based HRTF 3D Extension Positional Audio Chip

CMI8738
PCI-6CH C3DX series /PCI-Based HRTF 3D Extension Positional Audio Chip
Channel Format Register
Address 08H
Bit(s) R/W
31
30 FMOFFSET2
29
28-24
Name
Description
CHB3D5C
Enable 5 channels sound at channel B.
When Fmute=1, set this bit will initial FM PCM to offset 2 instead of ZERO, Default 0
CHB3D
enable 4 channels sound at channel B.
VersionID
Read Only. “00”
23
SETLAT48
set Latency Timer 48\h
22
21
20-16
15-14
13-12
11
EDGEIRQ
when „1‟, enable emulated edge trigger legacy IRQ to PCI bus #INTA,
default 0
SPD24SEL
when „1‟, and spd32sel=1 enable spdifout to play 24bit wave stream,
default „0‟
Reserved
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.
ADCDLEN
Sample method.
„00” (default)
„01‟
„10‟
„11‟
Original mode
Extra mode.
24k/22k mode.
Weight mode.
CH1 Double sample rate from 48K to 96K.
10
CH1 Double sample rate from 44.1K to 88.2K.
9
CH0 Double sample rate from 48K to 96K.
8
CH0 Double sample rate from 44.1K to 88.2K.
7 INVSPDIFI
Invert XSPDIFI signal for reverse SPDIF stream format, Default „0‟.
6 DBLSPDS
Double SPDIF sampling rate to 96K, 88.2k when set this bit, Default „0‟.
5
POLVALID
Inverse SPDIF/IN Valid bit, default 0.
4
SPDLOCKED A low active pulse to set read back status bit to „1‟. When write „1‟
to it will clear this bit to „0‟.
3:2
CH1FMT[1:0] Data format of channel 1
00 8 bit Mono mode
01 8 bit Stereo mode
10 16 bit
11 16 bit
Mono mode
Stereo mode
1:0
CH0FMT[1:0] Data format of channel0
00 8 bit Mono mode
01 8 bit Stereo mode
10 16bit Mono mode
11 16 bit Stereo mode
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