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LC7074M Datasheet PDF : 17 Pages
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LC7074, 7074M
4. Informative Bits in the Serial Data Output
• Error Flag (E) and Correction Flag (F)
The error flag (E) and the correction flag (F) in the serial data output are identical to the ERROR and CORRECTION
output pins, except that the logical levels are inverted.
The meaning of the error and correction flags differ slightly depending on the setting that determines whether input
data error correction is to be performed (the CORR.SEL pin). The tables below show the relations between the output
value combinations of the error and correction flags.
– When the CORR.SEL pin is high: Error correction enabled
No errors
Errors corrected
Uncorrectable errors
Error flag (E)
0
0
1
Correction flag (F)
0
1
1
ERROR pin
1
1
0
CORRECTION pin
1
0
0
The value combination where E is 1 and F is 0 (or equivalently, where the ERROR pin is 0 and the CORRECTION
pin is 1) cannot occur.
– When the CORR.SEL pin is high: Error correction disabled
No errors
Uncorrectable errors
Error flag (E)
0
1
Correction flag (F)
0
1
ERROR pin
1
0
CORRECTION pin
1
0
The value combination where E is 1 and F is 0 (or equivalently, where the ERROR pin is 0 and the CORRECTION
pin is 1) and where E is 0 and F is 1 (or equivalently, where the ERROR pin is 1 and the CORRECTION pin is 0)
cannot occur.
In this case, the combination indicating no errors is output if there were no errors in the data, and the combination
indicating uncorrectable errors is output when there are errors in the data whether or not those errors are correctable.
• Offset E (OE) and Offset F (OF)
When the IC has synchronized with the offset word E block data, the OE bit in the output data goes to “1”. At this
point the bits B1 and B0, which express the RDS block number, will be “00”, i.e., both will be zero.
The LC7074/M does not recognize an offset word F block as a correct offset word. Therefore, the OF bit in the output
data will always be “0”.
OE Bit Output
No.4789–11/17
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