WM8581 datasheet(64/100 Pages) WOLFSON

64 / 100 page

WM8581

Production Data

PD Rev 4.0 April 2007

The S/PDIF receiver reads channel status data from channel 1 only. The channel status data is

stored in five read-only status registers which can be read via the serial interface (see Serial Interface

Readback

). When new channel status data has been recovered and stored in registers, the Channel

Status Update (CSUD) bit is set to indicate that the status registers have updated and are ready for

readback. After readback, CSUD will be cleared until the registers are next updated. The CSUD flag

can be configured to be output on any of the GPO pins. The register descriptions for the channel

status bits are given below.

ADDRESS

BIT

LABEL

CHANNEL

STATUS

BIT

DEFAULT

DESCRIPTION

CON/PRO

0 = Consumer Mode

1 = Professional Mode

The WM8581 is a consumer mode device.

Detection of professional mode may give

erroneous behaviour.

AUDIO_N

Linear PCM Identification

0 = Data word represents audio PCM

samples.

1 = Data word does not represent audio

PCM samples.

CPY_N

0 = Copyright is asserted for this data.

1 = Copyright is not asserted for this data.

DEEMPH

0 = Recovered S/PDIF data has no pre-

emphasis.

1 = Recovered S/PDIF data has pre-

emphasis.

5:4

Reserved

5:4

Reserved for additional de-emphasis modes.

R44

SPDRXCHAN 1

2Ch

(read-only)

7:6

CHSTMODE

[1:0]

7:6

00 = Only valid mode for consumer

applications.

Table 56 S/PDIF Receiver Channel Status Register 1

WM8581 Datasheet(PDF) 64 Page - Wolfson Microelectronics plc

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