STAC9708 datasheet(31/56 Pages) ETC

31 / 56 page

SigmaTel, Inc.

Preliminary

STAC9708/11

10/02/98

for independent control of the stereo enhancement between LINE_OUT and DAC_OUT. SS3D provides

for a wider soundstage extending beyond the normal 2-speaker arrangement. Note that the 3D bit in the

general purpose register (20h) must be set to 1 to enable SS3D functionality and for the bits in 22h to

take effect.

Table 16, 17. 3D Control Registers

DP1, DP0

LINE_OUT

SEPARATION

RATIO

0 0

0 (Off)

0 1

3 (Low)

1 0

4.5 (Med)

1 1

6 (High)

DPR1, DPR0

DAC_OUT

SEPARATION

RATIO

0 0

0 (Off)

0 1

3 (Low)

1 0

4.5 (Med)

1 1

6 (High)

The three separation ratios are implemented as shown above. The separation ratio defines a series of

equations that determine the amount of depth difference (High, Medium, and Low) perceived during

two-channel playback. The ratios provide for options to narrow or widen the soundstage.

4.4.9

Multi-Channel Programming Register (Index 74h)

This read/write register is used to program the various options for multi-channel configurations. Only

the two LSBs are used (MC0 and MC1), and they define which AC-Link slot data is supplied to the

four audio DACs on the STAC9708/11. PCM2 in the table below is the surround stereo DAC, which

drives the DAC_OUT pins. The purpose of using slot 10 and 11 in the final configuration is to allow the

possibility of an eight channel architecture using two STAC9708 devices in the multi-codec

configuration. Also see “Multiple Codec Support” discussion for information on the use of external pins

CID1 and CID0.

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