wm9705seft-v Wolfson Microelectronics plc, wm9705seft-v Datasheet - Page 38

• Manufacturer Part Number: wm9705seft-v
• Description: Multimedia Ac?97 Codec With Integrated Touch Screen Controller
• Manufacturer: Wolfson Microelectronics plc

WM9705
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Table 22 ADC Slot Mapping Control
VENDOR SPECIFIC GAIN CONTROL REGISTER (INDEX 72h)
This register controls the gain and mute functions applied to the mixer path. This PGA is not
accommodated in the Intel specification, but is required in order to allow the option of
simultaneous recording of the mixer output and playback of DAC signals. The function is as for
the other mixer PGA’s. However, the default value of the register is not-muted. If it is not used it
will be transparent to the user. Normally this reigster would be used in collaboration with bit
ADCNDAC in register 5Ch, allowing recording of the analog mix, manipulation in the digital
domain by an external DSP, then playback through the DACs on the WM9705.
PEN DIGITIZER CONTROL REGISTERS (INDEX 76, 78h)
These registers are used for pen digitiser control. See Pen Digitiser Operation section, for details
of operation.
PEN DIGITIZER DATA REGISTER (INDEX 7Ah)
Register 7Ah is used to store the results of digitizer ADC conversions, both for pen inputs and for
auxiliary input conversions. Results are downloaded to the controller by interrogating this register.
See Pen Digitiser Operation section for more details.
VENDOR SPECIFIC ADDITIONAL FUNCTIONALITY (INDEX 74H)
HPB boosts the headphone output by 6dB. 1 = 6dB boost enabled.
I2S64 enables a 64fs bitclk output on SPDIF for i
MONOEN enables the mono output independently of PR2 (MIXER Powerdown). This allows the
DAC to MONOUT path to be powered up by resetting PR1 and setting MONOEN while the Mixer
is powered down (PR2 set), providing a lower power mode when the mixer function is not
required.
VENDOR ID REGISTERS (INDEX 7Ch AND 7Eh)
These registers are 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 WM9705 the vendor ID is set to WML5.
Wolfson is a registered Microsoft Plug and Play vendor.
00
01
10
11
ASS1, ASS0
Slots 3 and 4
Slots 7 and 8
Slots 6 and 9
Slots 10 and 11
ADC SLOT MAPPING ( L/R)
2
s data output. 1 = enabled.
PD Rev 4.5 July 2008
Production Data
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