Production Data

WM9709

w

PD Rev 1.3 February 2003

13

SERIAL INTERFACE REGISTER MAP DESCRIPTION

See Table 1.

Only special production test modes and vendor ID readback are supported by the WM9709 register

map. The test mode addresses are chosen to avoid conflict with any data that might be written to

normal AC’97 register addresses.

None of the typical AC’97 mixer, control, power up/down control functions are supported by the

WM9709.

VENDOR RESERVED REGISTER (INDEX 5AH)

This register is reserved for future use and is vendor specific. Do not write to these registers unless

the Vendor ID register has been checked first to ensure that the driver knows the source of the

AC’97 component. Values stored in this register are used to provide test modes for the

manufacturer.

VENDOR ID REGISTERS (INDEX 7Ch - 7Eh)

This register is for specific vendor identification if so desired. The ID method is Microsoft’s Plug and

Play Vendor ID code. The first character of that ID is F7 to F0, the second character S7 to S0 and

the third T7 to T0. These three characters are ASCII encoded. The REV7 to REV0 field is for the

Vendor Revision number. In the WM9709, the vendor ID is set to WML9.

SERIAL INTERFACE REGISTER MAP

The following table shows the function and address of the various control bits that are loaded

through the serial interface during write operations.

Reg.

Num.

Name

D15

D14

D13

D12

D11

D10

D9

D8

D7

D6

D5

D4

D3

D2

D1

D0

Default

5Ah

Vendor

Reserved

X

X

X

X

X

X

X

X

X

X

X

X

X

X

X

X

X

7Ch

Vendor ID1

F7

F6

F5

F4

F3

F2

F1

F0

S7

S6

S5

S4

S3

S2

S1

S0

574D

7Eh

Vendor ID2

T7

T6

T5

T4

T3

T2

T1

T0

REV

7

REV

6

REV

5

REV

4

REV

3

REV

2

REV

1

REV

0

4CO9

Table 1 Serial Interface Register Map Description