LC72705E View Datasheet(PDF) - SANYO -> Panasonic

Part Name

Description

Manufacturer

LC72705E

FM Multiplex Receiver IC for VICS Systems

SANYO -> Panasonic 

LC72705E

Structure of the Output Data

• The output data consists of a total of 288 bits (36 bytes). The first two bytes are status information, and data is output in

a single data block unit.

• CNT1 and CNT2 are output LSB first.

• The corrected data is output starting with the first bit in the data block.

• BIC codes are not output.

Note: The CPU can easily select data by discriminating the status information at first during data readout. Data that is

determined to be unnecessary can be immediately cancelled without reading it out. (The CPU can simply ignore

the data until the next interrupt arrives.)

For example, the CPU can also read out just the first 22 bytes (the data block section) of the corrected data, and

does not have to read out the unrequired 12 bytes (the layer 2 CRC and parity data).

288 bits (36 bytes)

Corrected data

176 bits

Parity

8 bits

8 bits

* Bit 0 is unused.

Layer 4 CRC shift register: Not all zeros

Layer 4 CRC shift register: All zeros (no errors)

Data for the first block is being output

Normal block data

Parity block data

Error correction and CRC check OK

Either an uncorrectable error or the NG CRC check

Indicates data received with frame synchronization not achieved

Indicates data received with frame synchronization achieved

Indicates data received with block synchronization not achieved

Indicates data received with block synchronization achieved

Output with horizontal correction only

Output after vertical correction

Notes:

• CRC indicates the layer 2 CRC check when the ERR flag is 1.

• The CRC4 result is the data immediately preceding the point when the CCB output address (#FB) was input and CE was high.

• The HEAD flag is only valid for horizontal correction data output, i.e. when VH is 0.

CNT2:

7

BLN7

6

BLN6

5

BLN5

4

BLN4

3

BLN3

2

BLN2

1

BLN1

0

BLN0

BLNK0 to BLNK7: Indicates either the block number for the output data or the parity block number.

The data blocks in a single frame are numbered 0 to 189, and the parity blocks are numbered 0 to 81.

Parity block data is not output for post-horizontal correction output.

No. 5744-9/14

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