SM8213 Ver la hoja de datos (PDF) - Nippon Precision Circuits
Número de pieza
componentes Descripción
Lista de partido
SM8213 Datasheet PDF : 33 Pages
| |||
SM8213AM
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).
Preamble
Continuous 575 - bit "1, 0" bit pattern
Sync
Code
1st Batch
2nd Batch
Sync
Code
12
19 20
21 22
31
32
1
32
Address signal 0 Address bits Function bits
Check bits Even - parity bit
Sync Code Word
Message signal 1
Message bits
Check bits Even - parity bit
1 Code Word
Frame No.
7 SC 0
1
2
3
4
5
6
7 SC 0
1 Frame(= 2 Code Words)
Sync Code Part
Frame Part
1 Batch
Figure 1. Receive signal format
Sync Code Part
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
Table 1. Sync code format
Bit number
1
2
3
4
5
6
7
8
Bit value
0
1
1
1
1
1
0
0
Bit number
9
10
11
12
13
14
15
16
Bit value
1
1
0
1
0
0
1
0
even-parity bit, making a 32-bit signal. The sync
code word pattern is shown in table 1.
Bit number
17
18
19
20
21
22
23
24
Bit value
0
0
0
1
0
1
0
1
Bit number
25
26
27
28
29
30
31
32
Bit value
1
1
0
1
1
0
0
0
NIPPON PRECISION CIRCUITS—7
Share Link: 