STA308A View Datasheet(PDF) - STMicroelectronics
Part Name
Description
MFG CO.
'STA308A' PDF : 63 Pages View PDF
STA308A
Registers
7.2.32 AUTO1 - AutoModes EQ, volume, GC (0x1F)
D7
AMDM
0
D6
AMGC2
0
D5
AMGC1
0
D4
AMGC0
0
D3
AMV1
0
D2
AMV0
0
D1
AMEQ1
0
D0
AMEQ0
0
Bit RW RST
Name
Description
1:0 RW
0
AMEQ[1:0]
Biquad 2-6 mode is:
00: user programmable
01: preset EQ - PEQ bits
10: graphic EQ - xGEQ bits
11: auto volume controlled loudness curve
By setting AMEQ to any setting other than 00 enables AutoMode EQ, biquads 1-5 are not
user programmable. Any coefficient settings for these biquads will be ignored. Also when
AutoMode EQ is used the pre-scale value for channels 1-6 becomes hard-set to -18 dB.
Bit RW RST
Name
3:2 RW
0
AMV[1:0]
6:4 RW
0
AMGC[2:0]
Description
AutoMode volume mode (MVOL) is:
00: MVOL 0.5 dB 256 steps (standard)
01: MVOL auto curve 30 steps
10: MVOL auto curve 40 steps
11: MVOL auto curve 50 steps
AutoMode gain compression/limiters mode is:
000: user programmable GC
001: AC no clipping
010: AC limited clipping (10%)
011: DRC nighttime listening mode
100: DRC TV commercial/channel AGC
101: AC 5.1 no clipping
110: AC 5.1 limited clipping (10%)
Bit RW RST
Name
Description
7
RW
0
AMDM
AutoMode 5.1 downmix:
0: normal operation
1: channels 7-8 are 2-channel downmix of channels
1-6
AutoMode downmix setting uses channels 7-8 of Mix#1 engine and therefore these
channels of this function are fixed and not allowed to be user set when in this mode.
Channels 1-6 must be arranged via channel mapping (registers CnIM) if necessary in the
following manner for this operation:
Channel 1: left
Channel 2: right
Channel 3: left surround
Channel 4: right surround
Channel 5: center
Channel 6: LFE.
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