Wolfson WM8804 - Page 39

Production Data WM8804
w
PD Rev 4.1 September 2007
39
NON_AUDIO Non-Audio Flag
Logical OR of PCM_N and AUDIO_N
Interrupt status
register,
GPO,
SDOUT - hardware
mode
CSUD Channel Status Update
Indicates that channel status registers have updated and may be read back
over the serial interface.
Interrupt status
register,
GPO
DEEMPH De-emphasis Flag
0 = Recovered data has no pre-emphasis
1 = Recovered data has pre-emphasis
S/PDIF Status
Register,
GPO
Table 45 S/PDIF Receiver Status Flags Description
‘WITH FLAGS’ MODE
The WM8804 features a ‘With Flags’ mode to enable the user to append status flags to the audio
sample streamed transmitted from the digital audio interface. When WITHFLAG is set to 1 ‘With
Flags’ mode is enabled and the flags in Table 47 are appended to the LSB of the audio sample. If
WITHFLAG is set to 0 ‘With Flags’ mode is disabled and only the audio sample is transmitted from
the digital audio interface.
REGISTER
ADDRESS
BIT LABEL DEFAULT DESCRIPTION
R29
SPDRX1
1Dh
4 WITHFLAG 0 Enable With Flags Mode
0 = Disabled
1 = Enabled
Table 46 With Flags Mode Control Register
WITH FLAGS BIT ORDER FLAG
0 V
1 U
2 C
3 192BLK
4 CSUD
5 TRANS_ERR
6 UNLOCK
7 NON_AUDIO
Table 47 Flags Appended to Audio Sample in ‘With Flags’ Mode
Diagrams illustrating ‘With Flags’ mode for each audio data format can be found on page 48 of the
data sheet (Figure 23 to Figure 27).
Note: 24-bit RJ digital audio interface mode does not support ‘With Flags’ mode.