WM8805
Production Data
Interrupt status
NON_AUDIO
Non-Audio Flag
register,
Logical OR of PCM_N and AUDIO_N
GPO,
SDOUT - hardware
mode
CSUD
Channel Status Update
Interrupt status
register,
Indicates that channel status registers have updated and may be read back
over the serial interface.
GPO
DEEMPH
De-emphasis Flag
S/PDIF Status
Register,
0 = Recovered data has no pre-emphasis
1 = Recovered data has pre-emphasis
GPO
Table 45 S/PDIF Receiver Status Flags Description
As the Table 45 shows, these flags can be reported via GPO pins (see Table 52) or via Read-back
registers.
‘WITH FLAGS’ MODE
The WM8805 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
1
2
3
4
5
6
7
V
U
C
192BLK
CSUD
TRANS_ERR
UNLOCK
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 49 of the
data sheet (Figure 23 to Figure 27).
Note: 24-bit RJ mode does not support ‘With Flags’ mode.
PD Rev 4.1 September 07
40
w
WOLFSON [ WOLFSON MICROELECTRONICS PLC ]
