AD1985

Rev. A | Page 42 of 48

Codec Class/Revision Register (Index 0x60, Page 01)

Reg Num

Name

D15 D14 D13 D12 D11 D10 D9

D8

D7

D6

D5

D4

D3

D2

D1

D0

Default

0x60

Codec Class/Rev

X

X

X

CL4

CL3

CL2

CL1 CL0 RV7 RV6 RV5 RV4 RV3 RV2 RV1 RV0 N/A

New register added for AC ’97 2.3.

RV[7:0]

Revision ID. (Read-only.)

The initial production version of the AD1985 reports three. This will increment with each stepping/revision of the codec chip.

CL[4:0]

Codec Compatibility Class. (Read-only.) The AD1985 will return 0x00 from these bits.

X

Reserved.

PCI Subsystem Vendor ID Register (Index 0x62, Page 01)

Reg Num

Name

D15

D14

D13

D12

D11

D10

D9

D8

D7

D6

D5

D4

D3

D2

D1

D0

Default

0x62

PCI SVID

PVI15 PVI14 PVI13 PVI12 PVI11 PVI10 PVI9 PVI8 PVI7 PVI6 PVI5 PVI4 PVI3 PVI2 PVI1 PVI0 N/A

New register added for AC ’97 2.3.

PVI[15:0]

PCI Subsystem Vendor ID. (Read/write.)

This field provides the PCI subsystem vendor ID of the audio or modem subassembly vendor (i.e., CNR manufacturer,

motherboard vendor). This is not the codec vendor PCI vendor ID, nor the AC ’97 controller PCI vendor ID. If data is not

written by BIOS or other applications, it will return 0xFFFF.

PCI Subsystem Device ID Register (Index 0x64, Page 01)

Reg Num

Name

D15

D14

D13

D12

D11

D10

D9

D8

D7

D6

D5

D4

D3

D2

D1

D0

Default

0x64

PCI SID

PI15

PI14

PI13

PI12

PI11

PI10

PI9

PI8

PI7

PI6

PI5

PI4

PI3

PI2

PI1

PI0

N/A

New register added for AC ’97 2.3.

PI[15:0]

PCI Vendor ID. (Read/write.)

This field provides the PCI subsystem ID of the audio or modem subassembly (i.e., CNR model, motherboard SKU). This is

not the codec vendor PCI ID, nor the AC ’97 controller PCI ID. Information in this field must be available for AC ’97

controller reads when codec ready is asserted in AC link. If data is not written by BIOS or other applications, it will return

0xFFFF.