STA308

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3.0.3 Bass Management Enable

Channel 6 of the STA308 features a bass management mode that enables redirection of information in all other

channels to this channel and which can then be filtered appropriately using the EQ(Biquad) section. Setting the

BME bit selects the output of the scale and mix block for channel 6 instead of the output of the channel mapping

block. The settings for the scale and mix block are provided by the CxBMS registers

3.0.4 DDX Headphone Output Enable

Channels 7 and 8 of the STA308 have the option to be processed for headphones. The headphone output can

then be driven using an appropriate output device. This signal is a fully differential 3-wire drive called DDX

Headphone

3.0.5 Max Power Correction

Setting the MPC bit turns on special processing that corrects the DDX power device at high power. This mode

should lower the THD+N of a full DDX system at maximum power output and slightly below. This mode will only

be operational in OM= 00 or 10.

3.1 Configuration Register B (address 01h)

3.1.1 DSP Bypass

Setting the DSPB bit bypasses the biquad and bass/treble functionality of the STA308.

3.1.2 Zero-Detect Mute Enable

Setting the ZDE bit enables the zero-detect automatic mute.

The zero-detect circuit looks at the input data to each processing channel after the channel mapping block. If

any channel receives 2048 consecutive zero value samples (regardless of fs) then that individual channel is

muted if this function is enabled.

BIT

R/W

RST

NAME

DESCRIPTION

5

R/W

0

BME

Bass Management Enable : 0 – No Bass Management

1 – Bass Management operation on channel 6, scale and add inputs

BIT

R/W

RST

NAME

DESCRIPTION

6

R/W

0

HPE

DDX Headphone Enable :

0 – Channels 7,8 normal DDX operation.

1 – Channels 7,8 DDX Headphone operation.

BIT

R/W

RST

NAME

DESCRIPTION

7

R/W

1

MPC

Max Power Correction : Setting of 1 enables DDX correction for THD reduction

near maximum power output.

BIT

D7

D6

D5

D4

D3

D2

D1

D0

NAME

DRC

ZCE

SAIFB

SAI2

SAI1

SAI0

ZDE

DSPB

RST

01

0

0

0

0

1

0

BIT

R/W

RST

NAME

DESCRIPTION

0

R/W

0

DSPB

DSP Bypass Bit : 0 – Normal Operation

1 – Bypass of Biquad and Bass/Treble Functionality

BIT

R/W

RST

NAME

DESCRIPTION

1

R/W

1

ZDE

Zero-Detect Mute Enable : Setting of 1 enables the

automatic zero-detect mute