WM8804 Datasheet, PDF (39/66 Pages) Wolfson Microelectronics plc – 1:1 Digital Interface Transceiver with PLL

Production Data
WM8804
NON_AUDIO
Non-Audio Flag
Logical OR of PCM_N and AUDIO_N
CSUD
DEEMPH
Channel Status Update
Indicates that channel status registers have updated and may be read back
over the serial interface.
De-emphasis Flag
0 = Recovered data has no pre-emphasis
1 = Recovered data has pre-emphasis
Table 45 S/PDIF Receiver Status Flags Description
Interrupt status
register,
GPO,
SDOUT - hardware
mode
Interrupt status
register,
GPO
S/PDIF Status
Register,
GPO
‘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 BIT
ADDRESS
LABEL
DEFAULT
DESCRIPTION
R29
4
WITHFLAG
0
Enable With Flags Mode
SPDRX1
0 = Disabled
1Dh
1 = Enabled
Table 46 With Flags Mode Control Register
WITH FLAGS BIT ORDER
0
1
2
3
4
5
6
7
FLAG
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 48 of the
data sheet (Figure 23 to Figure 27).
Note: 24-bit RJ digital audio interface mode does not support ‘With Flags’ mode.
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PD, Rev 4.5, March 2009
39