TDA7333N datasheet(22/36 Pages) STMICROELECTRONICS

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Functional description

TDA7333N

22/36

3.8.2

rds_qu register

3.8.3

rds_corrp register

(2) If "syncw" =1 of rds_bd_ctrl register, the block counter in-

dicates the expected RDS block.

(3) qu[3...0] counts the number of bits (max.16) which are

marked as bad by the demodulator within each RDS block.

It could be used as a quality information, indicating the max-

imum number of bits which are allowed to be corrected.

It indicates if error correction was successful.

1: The syndrome was zero after error correction.

0: The syndrome did not become zero and therefore the error

correction was not successful.

1: Block E is detected. This indicates a paging block which is

deÞned in the RBDS speciÞcation used in the United States of

America.

0: An ordinary RDS block A, B, C, C« or D is detected, or no valid

syndrome was found.

Bit 0 of block counter (2).

bit 1 of block counter (2).

bit 0 of quality counter (3).

bit 1 of quality counter (3).

bit 2 of quality counter (3).

bit 3 of quality counter (3).

bit name

access

bit 7

bit 0

bit 1

bit 2

bit 3

bit 4

bit 5

bit 6

rrr

synz

qu0

qu3

qu1

qu2

blk1

blk0

blk1

blk0

block A

block name

block D

block C,C'

block B

(2)

reset value

rds_qu

(4) (Refer to CENELEC Radio Data System speciÞcation

EN50067, ANNEX B). When bits 0...4 of the syndrome reg-

ister are zero, a possible error burst is detected. With help

of the correction pattern (bits 5...9 of the syndrome register),

the type of error can be measured, in order to classify the

reliability of the correction.

Buffer overflow

1: More than 24 blocks have been written into the buffer.

0: No buffer data has been overwritten.

Information if the current RDS data could be used.

1: A correct syndrome was detected and no error correction was

done on a good quality marked RDS bit and the flywheel counter is

greater than 2 (RDS data is OK).

0: The syndrome was wrong, or an error correction was done on a

good quality marked RDS bit, or the flywheel counter is lower than 3

(RDS data is not OK).

It is an information about error correction.

1: An error correction was done.

0: The actual RDS block is detected as error free.

bit 5 of the syndrome register(4).

bit 6 of the syndrome register(4).

bit 7 of the syndrome register(4).

bit 8 of the syndrome register(4).

bit 9 of the syndrome register(4).

bit name

access

bit 7

bit 0

bit 1

bit 2

bit 3

bit 4

bit 5

bit 6

bovf

dat_ok

cp6

cp9

cp7

cp8

cp5

correct

reset value

rds_corrp

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