AD1986ABSTZ datasheet(51/56 Pages) AD

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AD1986A

Rev. 0 | Page 51 of 56

Function

G [4:0]

(Gain Bits

(Read/Write))

The codec updates these bits with the gain value (dB relative to level-out) in 1.5 dBV increments, not including the volume

control gains. For example, if the volume gain is to 0 dB, then the output pin should be at the 0 dB level. Any difference in

the gain is reflected here. When relevant, the BIOS updates this bit to take into consideration external amplifiers or other

external logic that it knows about. G [3:0] indicates the magnitude of the gain. G [4] indicates whether the value is a gain or

attenuation—essentially it is a sign bit. These bits are only reset by a power-on reset because they are typically written by

the system BIOS and are not reset by codec hard or soft resets as long as power remains applied to the codec.

G [3:0]

Gain/Attenuation (dB Relative to Level-Out)

0000

0 dB

0001

+1.5 dB

...

+1.5 dB × G [3:0]

1111

+24.0 dB

0001

−1.5 dB

...

−1.5 dB × G [3:0]

1111

−24.0 dB

Reserved

Default: 0

SENSE REGISTER (REGISTER 0x6A, PAGE 01)

This address represents multiple registers (one for each supported function code (FC [3:0] bits (0x66 D [04:01])). The ST [2:0] bits are

only reset by power-on. They are used by the BIOS to store configuration information (per AC ’97 Revision 2.3 specifications) and must

not be reset by soft, hard, or hardware resets. The remaining bits are the result of the last sense operation performed by the impedance

sensing circuitry.

Reg

Name

D15

D14

D13

D12

D11

D10

Default

0x6A1

Sense

ST2

ST1

ST0

OR1

OR0

SR5

SR4

SR3

SR2

SR1

SR0

0xxxxx

Table 115.

Function

Default

SR [5:0] (RO)

(Sense Result

Bits, RO)

These bits are used to report a vendor specific fingerprint or value (resistance, impedance, or

reactance). Used with the OR bits which are the multiplying factor.

Default: 0

These bits indicate the order the sense result bits SR [5:0] are using. For example, if measuring resistance SR = 1/OR =

11: the result is 1 kΩ.

OR [1:0]

Order Value

100—SR bits indicate the actual impedance in ohms

Default

101—SSR bits indicate the impedance in ohms × 10

102—SR bits indicate the impedance in ohms × 100

OR [1:0] (RO)

(Order Bits)

103—SSR bits indicate the impedance in ohms × 1,000

S [4:0] (RO)

Sensed bits meaning relates to the I/O being sensed as input or output. Read-only. Sensed bits (when output sense

cycle initiated). This field allows for the reporting of the type of output peripheral/device plugged in the jack. Values

specified below should be interrogated with the SR [5:0] and OR [1:0] for accurate reporting.

S [4:0]

Sense Value

0x00

Data not valid. Indicates that the reported value(s) is invalid

0x01

No connection. Indicates that there are no connected devices

Default

0x02

Indicates a specific fingerprint value for devices that are not specified or are

unknown

0x03

Speakers (8 Ω)

0x04

Speakers (4 Ω)

0x05

Powered speakers

0x06

Stereo headphone

0x07

SPDIF out (electrical)

0x08

SPDIF out (TOS)

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