wm9709 Wolfson Microelectronics plc, wm9709 Datasheet - Page 13

• Manufacturer Part Number: wm9709
• Description: Ac-link Interface Audio Dac
• Manufacturer: Wolfson Microelectronics plc

Production Data
SERIAL INTERFACE REGISTER MAP DESCRIPTION
SERIAL INTERFACE REGISTER MAP
Table 1 Serial Interface Register Map Description
w
Reg.
Num.
5Ah
7Ch
7Eh
Name
Vendor
Reserved
Vendor ID1
Vendor ID2
D15
X
F7
T7
D14
X
F6
T6
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.
The following table shows the function and address of the various control bits that are loaded
through the serial interface during write operations.
D13
X
F5
T5
D12
X
F4
T4
F3
T3
D11
X
D10
X
F2
T2
D9
X
F1
T1
D8
X
F0
T0
D7
X
S7
REV
7
D6
X
S6
REV
6
D5
X
S5
REV
5
D4
X
S4
REV
4
D3
X
S3
REV
3
D2
X
S2
REV
2
PD Rev 1.3 February 2003
D1
X
S1
REV
1
WM9709
D0
X
S0
REV
0
Default
X
574D
4CO9
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