WM9704CFTSLASHV datasheet(27/37 Pages) WOLFSON

27 / 37 page

Production Data

WM9704M

WOLFSON MICROELECTRONICS LTD

PD Rev 3.2 January 2001

3D CONTROL REGISTER (INDEX 22H)

This register is used to control the centre and/or depth of the 3D stereo enhancement function built

into of the AC ‘97 component. Only the depth bits DP0 to 3 have effect in the WM9704M.

DP3…DP0

DEPTH

00%

Typical value

100%

RESERVED REGISTER (INDEX 24H)

This register was originally specified to control what sample rate AC’97 is sending or receiving

samples for the optional modem in and out. Not supported by the WM9704M.

POWERDOWN CONTROL/STATUS REGISTER (INDEX 26H)

This read/write register is used to program powerdown states and monitor subsystem readiness. The

lower half of this register is read only status, a 1 indicating that the subsection is “ready”. Ready is

defined as the subsection able to perform in its nominal state. When this register is written the bit

values that come in on AC-link will have no effect on read only bits 0 to 7.

When the AC-link “Codec Ready” indicator bit (SDATA_IN slot 0, bit 15) is a 1 it indicates that the

AC-link and the WM9704M control and status registers are in a fully operational state. The AC’97

controller must further probe this Powerdown Control/Status Register to determine exactly which

subsections, if any, are ready.

READ BIT

FUNCTION

REF

VREFs up to nominal level

ANL

Analogue mixers, etc ready

DAC

DAC section ready to accept data

ADC

ADC section ready to transmit data

Table 16 Powerdown Status Register Function

The powerdown modes are as follows. The first three bits are to be used individually rather than in

combination with each other. The last bit PR3 can be used in combination with PR2 or by itself. PR0

and PR1 control the PCM ADCs and DACs only. PR6 is not supported by the WM9704M.

WRITE BIT

FUNCTION

PR0

PCM in ADCs and input Mux powerdown

PR1

PCM out DACs powerdown

PR2

Analogue mixer powerdown (VREF still

on)

PR3

Analogue mixer powerdown (VREF off)

PR4

Digital interface (AC-link) powerdown

(external clock off)

PR5

Internal clock disable

PR6

HP amp powerdown – not supported

EAPD

External amplifier powerdown

Table 17 Powerdown Control Register Function

WM9704CFT/V Datasheet(PDF) 27 Page - Wolfson Microelectronics plc

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