WM9714CLGEFLSLASHV datasheet(76/120 Pages) CIRRUS

76 / 120 page

WM9714L

Rev 4.0

POWER MANAGEMENT

INTRODUCTION

The WM9714

L includes the standard power down control register defined by the AC’97 specification

(register 26h). Additionally, it also allows more specific control over the individual blocks of the device

through register Powerdown registers 3Ch and 3Eh. Each particular circuit block is active when both

the relevant bit in register 26h AND the relevant bit in the Powerdown registers 3Ch and 3Eh are set

to ‘0’.

Note that the default power-up condition is all OFF.

AC97 CONTROL REGISTER

ADDRESS

BIT

LABEL

DEFAULT

DESCRIPTION

26h

Powerdown/

Status

PR6

(disabled)

Output PGAs Disable Control

1 = Disabled

0 = Enabled

PR5

(disabled)

Internal Clock Disable Control

1 = Disabled

0 = Enabled

PR4

(disabled)

AC-Link Disable Control

1 = Disabled

0 = Enabled

PR3

(disabled)

Analogue Disable Control

1 = Disabled

0 = Enabled

Note: This control disables VREF, input PGAs,

DACs, ADCs, mixers and outputs

PR2

(disabled)

Input PGAs and Mixers Disable Control

1 = Disabled

0 = Enabled

PR1

(disabled)

Stereo DAC Disable Control

1 = Disabled

0 = Enabled

PR0

(disabled)

Stereo ADC and Record Mux Disable Control

1 = Disabled

0 = Enabled

REF

VREF Ready (Read Only)

1 = VREF ready

0 = VREF not ready

ANL

Analogue Mixers Ready (Read Only)

1 = Analogue mixers ready

0 = Analogue mixers not ready

DAC

Stereo DAC Ready (Read Only)

1 = DAC ready

0 = DAC not ready

ADC

Stereo ADC Ready (Read Only)

1 = ADC ready

0 = ADC not ready

Table 59

Powerdown and Status Register (Conforms to AC’97 Rev 2.2)

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