WM9705SEFTSLASHV datasheet(38/55 Pages) WOLFSON

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WM9705

Production Data

PD Rev 4.0 December 2003

ASS1, ASS0

ADC SLOT MAPPING ( L/R)

Slots 3 and 4

Slots 7 and 8

Slots 6 and 9

Slots 10 and 11

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)

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

2s data output. 1 = enabled.

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.

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