STAC9752 datasheet(73/95 Pages) IDT

73 / 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

8.4.6.

Digital Audio Control (6Ah, Page 00h)

To access Register 6Ah, Page 00h must be selected in Register 24h.

Information Valid Bit: Indicates whether a sensing method is provided by the

CODEC and if information field is valid. This field is updated by the CODEC.

0 - After CODEC RESET# de-assertion, it indicates the CODEC does NOT

provides sensing logic and this bit will be Read Only. After a sense cycle is

completed, indicates that no information is provided on the sensing method.

1 - After CODEC RESET# de-assertion, it indicates the CODEC provides

sensing logic for this I/O and this bit is Read/Write. After clearing this bit by

writing 1, when a sense cycle is completed the assertion of this bit indicates that

there is valid information in the remaining descriptor bits. Writing 0 to this bit has

no effect.

BIOS should NOT write this bit, as it is reset on RESET#.

3-1

RESERVED Bits not used, should read back 0

FIP

Function Information Present

This bit set to a 1 indicates that the G[4:0], INV, DL[4:0] (Register 68h, Page 01h)

and ST[2:0] (register 6Ah, Page 01h) are supported and R/W capable.

This bit is Read Only.

Table 22. Reg 68h Default Values

Reg 66h Function Code

Reg 68h Default Value

00h Line Out

0010h

01h Headphone Out

0010h

05h Mic1

0010h

06h Mic2

0010h

All other Function Codes

0000h

For RESET#: Reg 68h default value is 0000h.

Table 23. Gain or Attenuation Examples

G[4:0]

Gain or Attenuation (dB relative to level-out)

00000

0 dBV

00001

+1.5 dBV

01111

+24 dBV

10001

-1.5 dBV

11111

-24 dBV

Table 24. Register 68h/Page 01h Bit Overview

Bit

Bit R/W Overview

D15:D5

Read/Write and only reset on POR (Power on Reset) and not by RESET#.

Read/Write and should NOT be set by the BIOS

D3:1

Reserved

Read Only.

Bit(s) Reset Value

Name

Description

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