AD1986A Просмотр технического описания (PDF) - Analog Devices

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AD1986A

AC ’97 and HD Audio SoundMAX Codec

Analog Devices 

AD1986A

AC ’97 REGISTER DETAILS

RESET (REGISTER 0x00)

Writing any value to this register performs a register reset, which causes all registers to revert to their default values. The serial

configuration (0x74) register will not reset the SLOT16, REGM [2:0], SPOVR, SPAL, SPDZ, and SPLNK. These bits are reset on a hard,

hardware, or power-on reset. The REGM and serial configuration bits are reset only by an external hardware reset.

The AC ’97, Revision 2.3, Page 1 registers codec class/rev (0x601), PCI SVID (0x621), PCI SID (0x641), function information (0x681—per

supported function), and sense register ST [3:0] bits (0x6A1 D [15:13]—per supported function) are reset only on a power-on reset. To

satisfy the AC ’97, Revision 2.3 requirements, these registers/bits are sticky across all software and hardware resets.

Reading this register returns the ID code of the part and a code for the type of 3D stereo enhancement.

Reg Name D15 D14 D13 D12 D11 D10 D9 D8 D7 D6 D5 D4 D3 D2 D1 D0 Default

0x00 Reset x SE4 SE3 SE2 SE1 SE0 ID9 ID8 ID7 ID6 ID5 ID4 ID3 ID2 ID1 ID0 0x0290

Table 73.

Register

ID [9:0] (RO)

(Identify

Capability)

SE [4:0] (RO)

(Stereo

Enhancement)

x

Function

The ID decodes the capabilities of the AD1986A based on the functions.

Bit

Function

ID0

Dedicated MIC PCM In channel

ID1

Reserved (per AC ’97, Revision 2.3)

ID2

Bass and treble control

ID3

Simulated stereo (mono to stereo)

ID4

Headphone out support

ID5

Loudness (bass boost) support

ID6

18-bit DAC resolution

ID7

20-bit DAC resolution

ID8

18-bit ADC resolution

ID9

20-bit ADC resolution

The AD1986A does not provide hardware 3D stereo enhancement

(all bits are zero).

Reserved.

AD1986A ID [9:0]

0

0

0

0

1

0x290

0

0

1

0

1

Default: 0x00

Default: 0

MASTER VOLUME (REGISTER 0x02)

This register controls the LINE_OUT, SURROUND, and CENTER/LFE outputs’ mute and volume controls in unison. Each volume sub-

register contains five bits, generating 32 volume steps of −1.5 dB each for a range of 0 dB to −46.5 dB.

The headphone output (HP_OUT) mute and volume are controlled separately by the headphones volume register (0x04).The mono

output (MONO_OUT) mute and volume are controlled separately by the mono volume register (0x06). To control the LINE_OUT,

SURROUND, and CENTER/LFE volumes separately, use the front DAC volume register (0x18) for LINE_OUT; the surround DAC

Volume register (0x38) for SURROUND; and the C/LFE DAC volume register (0x36) for CENTER/LFE.

Reg Name

0x02 Master

Volume

D15 D14 D13 D12 D11 D10 D9 D8 D7 D6 D5 D4 D3 D2 D1 D0 Default

LM x x LV4 LV3 LV2 LV1 LV0 RM x x RV4 RV3 RV2 RV1 RV0 0x8080

Rev. 0 | Page 21 of 56

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