LC89057W-VF4A-E
10.4.5 Data processing upon occurrence of errors (lock error, parity error)
•
The data processing upon occurrence of an error is described below. If 8 or fewer input parity errors occur in
succession and transfer data is PCM audio data, the data is replaced by the one saved each in L-ch and R-ch in the
previous frame. However, if the transfer data is non-PCM data, the error data is output as it is. Non-PCM data is the
data of when bit 1 non-PCM data detection bit of the channel status turns to "H" based on the data detected prior to the
occurrence of the input parity error.
•
Output data is muted when a PLL lock error occurs or a parity error occurs 9 or more times in succession.
•
As for the channel status output, the data of the previous block is held in 1-bit units when a parity error occur 8 or
fewer times in succession.
Table 10.5 Data Processing upon Error Occurrence
Data
RDATA output
PLL Lock Error
Input Parity Error (a)
Input Parity Error (b)
Previous value data
Output
Input Parity Error (c)
Output
“L”
“L”
“L”
“L”
“L”
“L”
Output
“L”
fs calculation result
Channel status
Validity flag
Output
Previous value data
Output
Previous value data
Output
“L”
User data
“L”
Output
Output
* Input parity error (a): If occurs 9 or more times in succession
* Input parity error (b): If occurs 8 or fewer times in succession, in case of audio data
* Input parity error (c): If occurs 8 or fewer times in succession, in case of non-PCM burst data
•
Figure 10.11 shows an example of data processing upon occurrence of a parity error.
1occurrence
Input data
RERR
L-1 R-1 L-2 R-2 L-3 R-3 L-4 R-4 L-5 R-5 L-6 R-6 L-7 R-7 L-8 R-8
RLRCK
RDATA
L-0 R-0 L-1 R-0 L-2 R-2 L-2 R-2 L-2 R-2 L-2 R-2 L-2
R-ch
L-ch R-ch
9 times or mote : Muting
Previous
Previous
value data
value data
Figure 10.11 Example of Data Processing upon Parity Error Occurrence
No.7202-27/59
SANYO [ SANYO SEMICON DEVICE ]
