Audio Codec '97

AC ‘97 Component Specification Revision 2.3 Rev 1.0

Bit Default Function

RV[7:0] na Revision ID: (RO)

This register specifies a device specific revision identifier. The value is chosen

by the vendor. Zero is an acceptable value. This field should be viewed as a

vendor defined extension to the codec ID. This number changes with new

codec stepping of the same codec ID.

CL[4:0] na Codec Compatibility Class (RO)

This is a codec vendor specific field to define s/w compatibility for the codec.

S/W read this field together with codec vendor ID (reg 7C-7Eh) to determine

vendor specific programming interface compatibility. S/w can rely on vendor

specific register behavior to be compatible among vendor codecs of the same

class.

00h – Field not implemented

01h-1Fh – Vendor specific compatibility class code

X 0h Reserved

PVI[15:0] na PCI Sub System Vendor ID: (Optional)

This field provides the PCI Sub System Vendor ID of the Audio or Modem Sub

Assembly Vendor (i.e., CNR manufacturer, Motherboard Vendor). This is NOT

the codec vendor PCI Vendor ID, nor is it the AC ’97 controller PCI Vendor ID.

If not implemented this register is read only and must return value of 0x0h when

read. If the register is implemented and data is not available it should return

FFFFh.

PI[15:0] na PCI Vendor ID: (Optional)

This field provides the PCI Sub System ID of the Audio or Modem Sub

Assembly (i.e., CNR Model, Motherboard SKU). This is NOT the codec vendor

PCI ID, nor is it 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

not implemented this register is read only and must return value of 0x0h when

read. If the register is implemented and data is not available it should return

FFFFh.

Table 36. Discovery Register bits definition

5.9.2 Audio Input/Output Capabilities Register

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

66h Function Select X X X X X X X X X X X FC3 FC2 FC1 FC0 T/R 0h

68h Function Information G4 G3 G2 G1 G0 INV DL4 DL3 DL2 DL1 DL0 IV X X X FIP na

6Ah Sense details ST2 ST1 ST0 S4 S3 S2 S1 S0 OR1 OR0 SR5 SR4 SR3 SR2 SR1 SR0 na

Table 37. Audio Input/Output Capabilities Page ID 01