SM8211M datasheet(5/22 Pages) NPC

No. de pieza	SM8211M

Descripción Electrónicos	POCSAG Decoder For Pagers

PDF	22 Pages

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Fabricante Electrónico	NPC [Nippon Precision Circuits Inc]

Página de inicio	http://www.npc.co.jp/en

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SM8211M

NIPPON PRECISION CIRCUITS—5

FUNCTIONAL DESCRIPTION

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

Figure 1. Receive signal format

Preamble

1234

567

... 1 0 1 0 1 0 1 0 1 0 ...

1st batch

2nd and

successive

batches

Sync code word

1 frame (= 2 code words)

Frame number

1 code word (32 bits)

Continuous 576-bit "1,0" bit pattern

even-parity bit, making a 32-bit signal. The sync

code word pattern is shown in table 1.

Table 1. Sync code word

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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