STAC9752 datasheet(57/95 Pages) IDT

57 / 95 page

STAC9752/9753

TWO-CHANNEL, 20-BIT, AC’97 2.3 CODECS WITH HEADPHONE DRIVE, SPDIF OUTPUT MICROPHONE & JACK SENSING

IDT™

STAC9752/9753

REV 3.3 1206

TWO-CHANNEL, 20-BIT, AC’97 2.3 CODECS WITH HEADPHONE DRIVE, SPDIF OUTPUT MICROPHONE & JACK SENSING

This register is used to control the 3D stereo enhancement function, IDT Surround 3D (SS3D), built

into the AC'97 component. Note that register bits DP3-DP2 are used to control the separation ratios

in the 3D control for LINE_OUT. SS3D provides for a wider soundstage extending beyond the nor-

mal 2-speaker arrangement. Note that the 3D bit in the general purpose register (20h) must be set to

1 to enable SS3D functionality to allow the bits in 22h to take effect. The three separation ratios are

implemented. The separation ratio defines a series of equations that determine the amount of depth

difference (High, Medium, and Low) perceived during 2-channel playback. The ratios provide for

options to narrow or widen the soundstage.

8.1.17.

Audio Interrupt and Paging (24h)

Default: 0000h

Bit(s)

Reset Value

Name

Description

15:4

RESERVED

Bits not used, should read back 0

3:2

DP3, DP2

LINE_OUT SEPARATION RATIO

DP3 DP2 effect

0 ( OFF )

3 ( LOW )

4.5 ( MED )

6 ( HIGH )

1:0

RESERVED

Bits not used, should read back 0

D15

D14

D13

D12

D11

D10

RESERVED

PG3

PG2

PG1

PG0

Bit(s) Reset Value

Access

Name

Description

Read / Write

0 = Interrupt is clear

1 = Interrupt is set

Interrupt event is cleared by writing a 1 to this bit.

The interrupt bit will change regardless of condition of interrupt

enable (I0) status. An interrupt in the GPI in slot 12 in the ACLink

will follow this bit change when interrupt enable (I0) is unmasked.

14-13

Read Only

I3-I2

Interrupt Cause

00 = Reserved

01 = Sense Cycle Complete, sense info available.

10 = Change in GPIO input status

11 = Sense Cycle Complete and Change in GPIO input status.

These bits will reflect the general cause of the first interrupt event

generated. It should be read after interrupt status has been

confirmed as interrupting. The information should be used to scan

possible interrupting events in proper pages.

Read / Write

Sense Cycle

0 = Sense Cycle not in Progress

1 = Sense Cycle Start.

Writing a 1 to this bit causes a sense cycle start if supported. If

sense cycle is not supported this bit is read only.

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