STA308A STMicroelectronics, STA308A Datasheet - Page 38

• Manufacturer Part Number: STA308A
• Description: IC AUDIO PROCESSOR DGTL 64-TQFP
• Manufacturer: STMicroelectronics
• Series: DDX™r
• Type: Audio Processorr

Specifications of STA308A

• Mounting Type: Surface Mount
• Package / Case: 64-TQFP, 64-VQFP
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant
• Applications: -
• Lead Free Status / Rohs Status: Compliant

Registers
7.2.33
38/63
AUTO2 - AutoModes bass management2 (0x20)
Setting the AMBMME bit enables the proper mixing to take place for various preset bass
management configurations. Setting the AMBMXE bit enables the proper crossover filtering
in biquad #7 to take place. The crossover for bass management is always 2
(24 dB/oct) and the crossover frequency is determined by register bits PREEQ.XO[2:0].
All configurations of Dolby Bass Management can be performed in the IC. These different
configurations are selected as they would be by the end-user.
The AutoMode bass management settings utilize channels 1-6 on the Mix #1 engine,
Channels 1-6 biquad #6, and channels 1-2 on the mix #2 engine in configuration #2. These
functions cannot be user programmed while the bass management automode is active.
Not all settings are valid as some configurations are unlikely and do not have to be
supported by Dolby specification.
Automatic crossover settings are provided or custom crossovers can be implemented using
the available programmable biquads.
Input channels must be mapped using channel-mapping feature in the following manner for
bass management to be performed properly.
1: left front
2: right front
3: left rear
4: right rear
5: center
6: LFE
SUB
1
0
1
CSS - center speaker size
RSS - rear speaker size
Bit
Bit
D7
RW
RW
RW
RW
RSS1
0
D6
0
0
RST
RST
Bitfield
AMBMME
AMBMXE
RSS0
0
D5
Name
Name
CSS1
0
D4
0: AutoMode bass management mix disabled
1: AutoMode bass management mix enabled
0: AutoMode bass management crossover disabled
1: AutoMode bass management crossover enabled
Off
Off
CSS0
0
D3
10
FSS
0
Large
Large
Description
Description
D2
01
AMBMXE
0
D1
nd
Small
Small
order
AMBMME
0
STA308A
00
D0