WM8581 datasheet(76/100 Pages) WOLFSON

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WM8581

Production Data

PD Rev 4.0 April 2007

DR4

DR3

S/PDIF TRANSMITTER

DATA SOURCE

S/PDIF received data

ADC digital output data

Not available.

PAIF receiver data

Table 70 DR3 / DR4 Operation

The Secondary Audio Interface (SAIF) is not operational in Hardware Mode.

STATUS PINS

In Hardware control mode, SDO and SWMODE pins provide S/PDIF status flag information.

FLAG

DESCRIPTION

SWMODE

UNLOCK

Indicates that the S/PDIF Clock Recovery circuit is unlocked

or that the input S/PDIF signal is not present.

0 = Locked to incoming S/PDIF stream.

1 = Not locked to the incoming S/PDIF stream, or incoming

stream not present.

SDO

NON_AUDIO

Logical OR of PCM_N and AUDIO_N:

PCM_N indicates that non-audio code (defined in IEC-61937)

has been detected. AUDIO_N is the recovered Channel

Status bit-1.

Table 71 Hardware Mode Status Pins

DIGITAL AUDIO INTERFACE CONTROL

In Hardware Control Mode, CSB and SCLK become controls to configure the Primary Audio Interface

data format and word length. The configuration applies to both transmit and receive sides of the

interface. Table 72 below shows the options available.

CSB

SCLK

FORMAT & WORD LENGTH

24-bit right justified

20-bit right justified

24-bit left justified

24-bit I2S

Table 72 Audio Interface Hardware Mode Control

DAC MUTE CONTROL

In Hardware Control mode, the MUTE pin activates the softmute function on all the DACs. In

Software Control mode, MUTE activates softmute on the DAC selected by the DZFM register (when

the MPDENB bit is low). See page 37 for a detailed description of the softmute function and the

other methods of activating softmute.

When floating, the MUTE pin becomes an output for the ZFLAG flag.

MUTE

DESCRIPTION

Normal Operation

Mute DAC channels

Floating

MUTE is an output to indicate when Zero Detection occurs on all DACs

(ZFLAG).

H = detected, L = not detected.

Table 73 MUTE Pin Control Options

WM8581 Datasheet(PDF) 76 Page - Wolfson Microelectronics plc

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