WM8580_07 datasheet(58/92 Pages) WOLFSON

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WM8580

Production Data

PD Rev 4.0 February 2007

AUDIO DATA HANDLING

The S/PDIF receiver recovers the data and VUCP bits from each sub-frame. If the S/PDIF input data

is in a non-compressed audio format the data can be internally routed to the stereo data input of

DAC1. The WM8580 can detect when the data is in a non-compressed audio format and will

automatically mute the DAC. See Non-Audio Detection for more detail.

The received data can also be output over the digital audio interfaces in any of the data formats

supported. This can be performed while simultaneously using DAC1 for playback. The received data

may also be re-transmitted via the S/PDIF transmitter.

USER DATA

The WM8580 can output recovered user data received using GPO pins. See Table 66 for General

Purpose Pin control information.

CHANNEL STATUS DATA

The channel status bits are recovered from the incoming data stream and are used to control various

functions of the device. The recovered MAXWL and RXWL bits are used to truncate the recovered

24-bit audio word to so that only the appropriate numbers of bits are used by the other interfaces

(except the S/PDIF transmitter which always processes the full 24-bit recovered word).

Should the recovered DEEMPH channel status be set, and the S/PDIF receiver is routed to DAC1,

the de-emphasis filter is activated for DAC1.

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

stored in five read-only 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 WM8580 is a consumer mode device.

Detection of professional mode may give

erroneous behaviour.

AUDIO_N

Recovered S/PDIF Channel status bit 1.

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 55 S/PDIF Receiver Channel Status Register 1

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