WM8804 datasheet(43/66 Pages) WOLFSON

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WM8804

PD Rev 4.1 September 2007

NON-AUDIO DETECTION

The SPDIF payload can contain PCM data for audio or non-audio applications. In the case where the

payload contains the 96 bit synchronization code defined in IEC61937 then this indicates that the

payload contains data which is not suitable for direct playback through an audio codec. This 96 bit

code is defined as 4*16bits of ‘0’+Pa (16bits)+Pb (16bits)..

If the S/PDIFRx interface decodes this sync code then it sets the PCM_N bit.

When the PCM_N =1, then it indicates non-audio data. When the PCM_N =0, then it indicates that

the SPDIF payload does not contain the synch code..

Another status bit, AUDIO_N status is recovered from the Channel Status block. It is bit 1 of the

channel status. When AUDIO_N =0, then it indicates that the SPDIF payload contains audio PCM

encoded data. This is also referred to as linear PCM data. When the AUDIO_N= 1, then it indicates

that the SPDIF payload does not contain audio PCM data.

NON_AUDIO data is indicated by a logical OR of the AUDIO_N and PCM_N flags.

Any change of AUDIO_N or PCM_N status will cause an INT_N interrupt (UPD_NON_AUDIO) to be

generated. If the MASK register bit for AUDIO_N or PCM_N is set, then the associated signal will not

generate an interrupt (UPD_NON_AUDIO).

GENERAL PURPOSE OUTPUT (GPO) CONFIGURATION

The WM8804 has a maximum of three configurable GPO pins depending upon the mode of

operation of the device. By default GPO0 is available, however if 2-wire Software Control Mode is

selected the CSB pin becomes GPO1 and the SDOUT pin becomes GPO2.

ADDRESS

BIT

LABEL

DEFAULT

DESCRIPTION

R23

GPO0

17h

3:0

GPO0[3:0]

0000

(INT_N)

R24

GPO1

18h

3:0

GPO1[3:0]

0111

(UNLOCK)

R26

GPO2

1Ah

7:4

GPO2[3:0]

0100

(TRANS_ERR)

Flags and status bits available on GPO pins

0000 = INT_N

0001 = V

0010 = U

0011 = C

0100 = TRANS_ERR

0101 = SFRM_CLK

0110 = 192BLK

0111 = UNLOCK

1000 = NON_AUDIO

1001 = CSUD

1010 = DEEMPH

1011 = CPY_N

1100 = ZEROFLAG

1101 = 0

↓

1111 = 0

Note 1: GPO1 and GPO2 are only available in 2-

wire software control mode.

Note 2: Refer to Table 45 for signal descriptions

Table 52 GPO Control Registers

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