SM8212 datasheet(7/32 Pages) NPC

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NIPPON PRECISION CIRCUITS-7

SM8212B

Sync Code Part

1 Batch

Frame Part

1 Code Word

Sync Code Part

Sync Code Word

Address bits

Function bits

Check bits

Message bits

19 20

21 22

Even-parity bit

Check bits

Address signal

Message signal

1 Frame (= 2 Code Words)

Preamble

1st Batch

2nd Batch

Frame No.

Continuous 575-bit "1, 0" bit pattern

Sync

Code

Sync

Code

Figure 1. Receive signal format

Bit number

Bit value

Bit number

Bit value

Bit number

Bit value

Bit number

Bit value

1091

Table 1. Sync code format

FUNCTIONAL DESCRIPTION

1. Receive Format

The sync signal is a continuous code word in the received

signal, used for word synchronization. It comprises 31 bits

in an M-series bit pattern plus one even-parity bit, making

a 32-bit signal. The sync code word pattern is shown in

table 1.

(1) Sync signal (SC)

Unless otherwise specified, values in diagrams without

parentheses are for 512 bps, in ( ) are for 1200 bps, and in

[ ] are for 2400 bps. “M” represents the value of PL5

(MSB) to PL0 (LSB), and “N” represents the value of RF5

(MSB) to RF0 (LSB).

The receive format conforms to CCIR RPC No. 1

(POCSAG).

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