REV. 0

AD1981A

–20–

Table I. Jack Sense Mute Table – JSMT [2:0]

REF JS1

JS0

JSMT2

JSMT1

JSMT0

H.P.

LINE

MONO

NOTES

HEADPHONE

LINE OUT

OUT

OUT

OUT

0 OUT (0)

OUT (0)

0

0

0 ACTIVE ACTIVE ACTIVE JS0 and JS1

1 OUT (0)

IN

(1)

0

0

0 ACTIVE ACTIVE ACTIVE Ignored

2 IN

(1)

OUT (0)

0

0

0 ACTIVE ACTIVE ACTIVE

3 IN

(1)

IN

(1)

0

0

0 ACTIVE ACTIVE ACTIVE

4 OUT (0)

OUT (0)

0

0

1 FMUTE FMUTE ACTIVE JS0 no mute action,

5 OUT (0)

IN

(1)

0

0

1 FMUTE ACTIVE ACTIVE JS1 mutes Line_out

6 IN

(1)

OUT (0)

0

0

1 ACTIVE FMUTE ACTIVE

7 IN

(1)

IN

(1)

0

0

1 ACTIVE FMUTE ACTIVE

8 OUT (0)

OUT (0)

0

1

0 FMUTE FMUTE ACTIVE JS0 no mute action,

9 OUT (0)

IN

(1)

0

1

0 FMUTE ACTIVE ACTIVE JS1 mutes Mono and

10 IN

(1)

OUT (0)

0

1

0 ACTIVE FMUTE FMUTE Line_out

11 IN

(1)

IN

(1)

0

1

0 ACTIVE FMUTE FMUTE

12 OUT (0)

OUT (0)

0

1

1 **

**

**

**

RESERVED

13 OUT (0)

IN

(1)

0

1

1 **

**

**

14 IN

(1)

OUT (0)

0

1

1 **

**

**

15 IN

(1)

IN

(1)

0

1

1 **

**

**

16 OUT (0)

OUT (0)

1

0

0 FMUTE FMUTE ACTIVE JS0 mutes Mono,

17 OUT (0)

IN

(1)

1

0

0 FMUTE ACTIVE FMUTE JS1 no mute action

18 IN

(1)

OUT (0)

1

0

0 ACTIVE FMUTE ACTIVE

19 IN

(1)

IN

(1)

1

0

0 ACTIVE ACTIVE FMUTE

20 OUT (0)

OUT (0)

1

0

1 FMUTE FMUTE ACTIVE JS0 mutes Mono,

21 OUT (0)

IN

(1)

1

0

1 FMUTE ACTIVE FMUTE JS1 mutes Line_out

22 IN

(1)

OUT (0)

1

0

1 ACTIVE FMUTE ACTIVE

23 IN

(1)

IN

(1)

1

0

1 ACTIVE FMUTE FMUTE

24 OUT (0)

OUT (0)

1

1

0 FMUTE FMUTE ACTIVE JS0 mutes Mono,

25 OUT (0)

IN

(1)

1

1

0 FMUTE ACTIVE FMUTE JS1 mutes Mono and

26 IN

(1)

OUT (0)

1

1

0 ACTIVE FMUTE FMUTE Line_out

27 IN

(1)

IN

(1)

1

1

0 ACTIVE FMUTE FMUTE

28 OUT (0)

OUT (0)

1

1

1 **

**

**

**

RESERVED

29 OUT (0)

IN

(1)

1

1

1 **

**

**

30 IN

(1)

OUT (0)

1

1

1 **

**

**

31 IN

(1)

IN

(1)

1

1

1 **

**

**

FMUTE = Output is forced to mute independent of the respective volume register setting.

ACTIVE = Output is not muted and its status is dependent on the respective volume register setting.

OUT = Nothing plugged into the jack and, therefore, the JS status is low (via the load resistor pull-down).

IN = Jack has plug inserted and therefore the JS status is high (via the CODEC JS internal pull-up).

Serial Configuration (Index 74h)

This register is not reset when the reset register (Register 00h) is written.

SPLNK

SPDIF LINK: This bit enables the SPDIF to link with the DAC for data requesting.

0 = SPDIF and DAC are not linked.

1 = SPDIF and DAC are linked and receive same data requests (reset default).

SPDZ

SPDIF DACZ:

0 = Repeat last sample out the SPDIF stream if FIFO underruns (reset default).

1 = Forces “midscale” sample out the SPDIF stream if FIFO underruns.

SPAL

SPDIF ADC Loop Around:

0 = SPDIF transmitter is connected to the AC-LINK stream (reset default).

1 = SPDIF transmitter is connected to the digital ADC stream, not the AC-LINK.

INTS

INTERRUPT MODE SELECT: This bits selects the JS interrupt implementation path.

0 = Bit 0 SLOT 12 (Modem Interrupt)

1 = Slot 6 Valid Bit (MIC ADC Interrupt)

CHEN

Chain Enable:

This bit enables chaining of a slave CODEC SDATA_IN stream into the ID0 Pin (45).

0 = Disable Chaining (Reset Default)

1 = Enable Chaining into ID0 Pin

Reg Num Name

D15

D14

D13

D12

D11 D10 D9

D8

D7 D6 D5

D4

D3

D2

D1

D0

Default

74h

Serial Configuration SLOT16 REGM2 REGM1 REGM0

X

X

X CHEN X

X

X INTS X SPAL SPDZ SPLNK 7001h