STA306

16/33

3.3.4 Biquad Coefficient Link

For ease of use, all channels can use the biquad coefficients loaded into the Channel 1 Coefficient RAM space

by setting the BQL bit to 1. Then any EQ updates would only have to be performed once.

3.4 Configuration Register E (address 04h)

The scale and mix functionality can be used to mix adjacent channels instead of for bass management. By set-

ting this bit(BME must be set to 0) odd channels will be mixed with their adjacent even channel and output in

the place of the even channel. The odd channel wills pass-through unscaled. The values used for this function

are the same as for bass management. Since this function occurs post channel mapping a large number of

possibilities are present for two channel mixing. Up to four mixed channels can be obtained.

When VOLEN set to 1, volume operation is normal. When set to 0, volume operation is bypassed and the vol-

ume stages are all set to pass-through. This also eliminates the digital volume offset of ~-0.6dB that is used to

map full-scale digital input to full DDX modulation output.

By setting this bit to one deemphasis will implemented on all channels. When this is used it takes the place of

biquad #1 in each channel and any coefficients using biquad #1 will be ignored. DSPB(DSP Bypass) bit must

be set to 0 for Deemphasis to function.

The STA306 features a configurable digital serial audio interface. The settings of the SAIx bits determine how

the output to this interface is interpreted. Six formats are accepted.

BIT

R/W

RST

NAME

DESCRIPTION

7

R/W

0

BQL

Biquad Link :

0 – Each Channel uses coefficient values

1- Each Channel uses Channel 1 coefficient values

BIT

D7

D6

D5

D4

D3

D2

D1

D0

NAME

RES

SAOFB

SAO2

SAO1

SAO0

DEMP

VOLEN

MIXE

RST

0

0

0

000

1

0

BIT

R/W

RST

NAME

DESCRIPTION

0

R/W

0

MIXE

Mix Enable: 0 – Normal Operation

1 - Adjacent Channel Mix Mode

BIT

R/W

RST

NAME

DESCRIPTION

1

R/W

1

VOLEN

Volume Enable: 0 – Volume Operation Bypassed

1 - Volume Operation Normal

BIT

R/W

RST

NAME

DESCRIPTION

2

R/W

0

DEMP

Deemphasis : 0 – No Deemphasis, 1- Deemphasis

BIT

R/W

RST

NAME

DESCRIPTION

3

R/W

0

SAO0

Serial Audio Output Interface Format : Determines the interface

format of the output serial digital audio interface.

4

R/W

0

SAO1

5

R/W

0

SAO2