LC890561W Datasheet, PDF (19/47 Pages) Sanyo Semicon Device – CMOS IC Digital Audio Interface Receiver with Built-in Data Buffer Memory

LC890561W
12.6 Lock Error and Data Error Signal (ERROR)
• ERROR outputs an error flag, when PLL lock error arises or when a data error arises.
• The output form of an error signal is chosen by the ERF[1:0] commands.
12.6.1 PLL Lock Error
• PLL is unlocked to the data that has lost the pattern of input bi-phase modulation or which preamble B, M and W
cannot be detected.
• ERROR outputs high upon occurrence of PLL lock error and outputs low after holding high for 3msec to 300msec
after data demodulation returns to normal. See Figure 12.8.
• After PLL is locked, the holding period for high output of ERROR is decided by counting preamble B. Also, this
period is changeable with EWT [1:0] commands.
12.6.2 Input Data Parity Error
• Parity bit errors (odd number) of input data and input parity errors are detected.
• If nine or more input parity errors occur in succession, ERROR outputs high, and then low after detecting the PLL
lock status and holding high for 3 to 300msecs.
• If eight or fewer input parity errors occur in succession, the output format of error flag can be selected with ERF[1:0]
commands.
ERROR occurrence status
OK NG OK OK NG OK OK OK OK OK
Input data
L-191 R-191 L-0 R-0 L-1 R-1 L-2 R-2 L-3 R-3
LRCK
DATAO
R-189 L-190 R-190 L-191 R-190 L-0 R-0 L-0 R-1 L-2
ERROR
* ERROR data is replaced with previous value data.
Figure 12.6 Parity Error Flag Output Timing Chart (ERF[1:0] = 01, non delay setting)
12.6.3 Others Error
• Even when ERROR goes low, channel status bits 24 to 27 (sampling frequency) are continuously sampled and the
previous block of data and the current data are compared. If they are different, ERROR goes high immediately and the
same processing as for the PLL lock error is performed. However, even if input data changes after ERROR goes low
and the channel status information does not change, or if the input data changes within the PLL capture range,
ERROR does not go high.
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