WM8581 datasheet(71/94 Pages) WOLFSON

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WM8581

PP Rev 1.0 March 2006

STATUS PINS

In Hardware control mode, SDO, SWMODE and MFP8/9/10 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.

MFP8

Recovered channel-bit for current sub-frame

MFP9

SFRM_CLK

Indicates current sub-frame:

1 = Sub-frame A

0 = Sub-frame B

MFP10

192BLK

Indicates start of 192-frame block. High for duration of frame

0, low after frame 0.

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 I

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 34 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

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