wm9703 ETC-unknow, wm9703 Datasheet - Page 26

• Manufacturer Part Number: wm9703
• Manufacturer: ETC-unknow

WM9703
VENDOR RESERVED REGISTERS (INDEX 5Ah AND 7Ah)
WOLFSON MICROELECTRONICS LTD
Table 18 Extended Audio Capability Register
REGISTER 2Ah – EXTENDED AUDIO STATUS AND CONTROL REGISTER
The Extended Audio Status and Control Register is a read/write register that provides status and
control of the extended audio features.
Table 19 Extended Audio Status and Control Register
REGISTER 2Ch TO 32h – AUDIO SAMPLE RATE CONTROL REGISTERS
These registers are read/write registers that are written to, to select alternative sample rates for the
audio PCM converters. Default is the 48ks/s rate. Note that only Revision 2.1 recommended rates
are supported by the WM9703, selection of any other unsupported rates will cause the rate to default
to the nearest supported rate, and the supported rate value to be latched and so read back.
Register 2Ch is the front DAC rate register, but is also used for centre channel data rate.
REGISTERS 36h AND 38h – 6 CHANNEL VOLUME CONTROL
These read/write registers control the output volume of the optional four PCM channels. (not
supported by the WM9703)
These registers are 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.
VENDOR SPECIFIC GAIN CONTROL REGISTERS – (INDEX 70h TO 74h)
Not used in the WM9703.
VENDOR ID REGISTERS (INDEX 7Ch TO 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 REVISION7 to REVISION0 field
is for the Vendor Revision number. In the WM9703 the vendor ID is set to WML3.
Wolfson is a registered Microsoft Plug and Play vendor.
DATA BIT
DATA BIT
MADC
CDAC
SDAC
LDAC
VRM
VRA
DRA
PRK
PRL
PRJ
CDAC
SDAC
AMAP
PRI
LDAC
VRM
DRA
VRA
ID1
ID0
FUNCTION
Enables variable rate audio mode
Enable double rate audio mode
Enables variable rate Mic ADC
Indicates centre DAC ready
Indicates surround DAC ready
Indicates LFE DAC ready
Indicates Mic ADC ready
Set to turn off centre DAC
Set to turn off surround DACs
Set to turn off LFE DACs
Set to turn off Mic ADC
FUNCTION
Variable rate audio support
Double rate audio support
Variable rate Mic ADC support
Centre DAC support
Surround DAC support
LFE DAC support
Slot to front DAC mapping support
Codec configuration – pin 45 value
Codec configuration – pin 46 value
READ/WRITE
Read/write
Read/write
Read/write
Read/write
Read/write
Read/write
Read/write
Read
Read
Read
Read
Inverse of level at pin 45
Inverse of level at pin 46
ANY MODE
WM9703 SUPPORT
1
0
0
0
0
0
1
PD Rev 3.4 January 2001
Enable only
Enable only
Enable only
Production Data
Yes
Yes
Yes
Yes
No
No
No
No
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