CMI8738-MX Datasheet, PDF (18/32 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
Micellaneous Control Register
Bit(s) R/W
Name
Description
Address 18H
31
PWD
Power Down Mode enabled..
30
RESET
Reset Bus Master/DSP Engine.
29
Reserved
28
VMGAIN
Additional analog master amp. +6dB gain control
0 Disabled, default setting
1 Enabled (boost +6dB gain, only valid if the master volume
registers have been set with 0xFFh max. value.)
27
Reserved
26
N4SPK3D
Hardware copy front channel to rear channel
25
SPDO5V
SPDIF-out level setting
24
W / SPDIF48K ; R / SPATUS48K ;
23
ENDBDAC
Default low, High will enable Double DAC structure.
22
XCHGDAC
Default low,
0 CH0 > Front SPKR, CH1 > Back SPKR.
1 CH0 > Back SPKR, CH1 > Front SPKR.
21
SPD32SEL
when high, support 32bits SPDIF format ,low 16bits
20
SPDFLOOPI internal SPDIF/OUT loopback to internal SPDIF/IN, for loopback testing
19
FM_EN
Legacy FM enabled.
18
AC3_EN
Enable AC3 control register in SPDIFOut format, default 0.
17
Reserved
16
ENWRASID
Setting high choose to use the writable internal SUBID in the
configuration space of the Audio function.
15
SPDF_AC97 0: SPDIF/OUT 44.1K 1:SPDIF/OUT 48K(share with AC97 transfer)
14
MASK_EN
Activate channel mask on Legacy DMA.
0 Disabled
1 Enabled
13
ENWRMSID
Setting high choose to use the writable internal SubID in the
configuration space of the modem function.
12-9
Reserved
8
SELSPDIFI2 Select secondary SPDIF In , default 0.
7
ENCENTER
Enable Center Channel, default 0.
6
MUTECH1
Mute PCI channel 1 to Analog DAC.
5
Reserved
4
MIDSMP
Enable 1/2 interpolation at the Front end DAC..
3:2
UPDDMA[1:0] For every the number of samples to notify updating TDMA position.
00 Every 2048 samples
01 Every 1024 samples
10 Every 512 samples.
11 Every 256 samples.
1
TWAIT1
The length of FM I/O cycle in unit of PCICLK.
0 48 PCICLKs.
1 64 PCICLKs.
0
TWAIT0
The length of I/O cycle but FM in unit of PCICLK.
0 4 PCICLKs.
1 6 PCICLKs.
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