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STA310 数据表(PDF) 63 Page - STMicroelectronics

部件名 STA310
功能描述  62-CH. MULTISTANDARD AUDIO DECODER
PDF  90 Pages
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制造商  STMICROELECTRONICS [STMicroelectronics]
网页  http://www.st.com
标志 STMICROELECTRONICS - STMicroelectronics

STA310 数据表(HTML) 63 Page - STMicroelectronics

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STA310
CHAN_IDX
Channel Index
Address: 0x67
Type: R/W
Software Reset: 4
Hardware Reset: UND
Description:
This register identifies the pair of channels and the
type of access:
s
To read a volume, the register
CHAN_IDX
must be set to the appropriate value. The DSP
indicates that the attenuation is readable
through registers
VOLUME0 and
VOLUME1 by changing automatically the
CHAN_IDX to value 4.
s
To write a volume, the attenuation of the pair of
channel should be written in
VOLUME0 and
VOLUME1 registers. Then the
CHAN_IDX
register is written to the appropriate value. The
attenuation is updated on the next audio block
and
CHAN_IDX value is automatically
changed to 4.
9.16 Dolby Digital configuration registers
AC3_DECODE_LFE
Decode LFE
Address: 0x68
Type: R/W
Software Reset: NC
Hardware Reset: UND
Description:
When this register is set to 1, the device decodes
LFE channel (if present).
AC3_COMP_MOD
Compression mode
Address + 0x69
Type: R/W
Software Reset: NC
Hardware Reset: UND
Description:
The value of this register defines the compression
mode. In custom A mode, the dialog normalization
function is not done by the audio decoder, it has to be
done by an external analog part. In all other modes
the normalization is done by audio decoder.
765
43
2
1
0
Reserved
CHAN_IDX
Bitfield
value
Channel pair
Access
comment
CHAN_I
DX
0
Left and Right write
1
Center and
Subwoofer
write
2
Left surround
and right
surround
write
3
reserved
reserved
4
no pair
selected
none
Indicates
that volume
can be read
or written
5
Left and Right read
6
Center and
Subwoofer
read
7
Left surround
and right
surround
read
765
432
1
0
7
65432
1
0
Value
Meaning
0
Custom A (Analog)
1
Custom D (Digital)
2
Line Out
3
RF Mode



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