SM8213 datasheet(7/33 Pages) NPC

7 / 33 page

SM8213AM

NIPPON PRECISION CIRCUITS—7

FUNCTIONAL DESCRIPTION

Unless otherwise speciﬁed, values in diagrams with-

out 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” repre-

sents the value of RF5 (MSB) to RF0 (LSB).

Receive Format

The receive format conforms to CCIR RPC No. 1 (POCSAG).

Sync signal (SC)

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.

Figure 1. Receive signal format

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

Table 1. Sync code format

Bit number

Bit value

Bit number

Bit value

Bit number

Bit value

Bit number

Bit value

1091

101180261

110190270

121201281

130210291

140221300

151230310

160241320

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