wm8805 Wolfson Microelectronics plc, wm8805 Datasheet - Page 40

• Manufacturer Part Number: wm8805
• Description: 8 1 Digital Interface Transceiver With Pll
• Manufacturer: Wolfson Microelectronics plc

WM8805
Table 45 S/PDIF Receiver Status Flags Description
w
NON_AUDIO
DEEMPH
CSUD
Non-Audio Flag
Logical OR of PCM_N and AUDIO_N
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
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.
Table 46 With Flags Mode Control Register
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.
WITH FLAGS BIT ORDER
REGISTER
ADDRESS
SPDRX1
R29
1Dh
0
1
2
3
4
5
6
7
BIT
4
WITHFLAG
LABEL
TRANS_ERR
NON_AUDIO
UNLOCK
192BLK
CSUD
FLAG
DEFAULT
V
U
C
0
Enable With Flags Mode
0 = Disabled
1 = Enabled
DESCRIPTION
PD, Rev 4.5, March 2009
Interrupt status
register,
GPO,
SDOUT - hardware
mode
Interrupt status
register,
GPO
S/PDIF Status
Register,
GPO
Production Data
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