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參數(shù)資料
| 型號： | SM8212 |
| 廠商： | Seiko NPC Corporation |
| 英文描述： | POCSAG Decoder For Multiframe Pagers |
| 中文描述： | POCSAG碼解碼器多幀尋呼機 |
| 文件頁數(shù)： | 9/32頁 |
| 文件大?。?/td> | 167K |
| 代理商： | SM8212 |
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NIPPON PRECISION CIRCUITS-9
SM8212B
(4) Idle signal
Bit number
1
2
3
4
5
6
7
8
Bit value
0
1
1
1
1
0
1
0
Bit number
9
10
11
12
13
14
15
16
Bit value
1
0
0
0
1
0
0
1
Bit number
17
18
19
20
21
22
23
24
Bit value
1
1
0
0
0
0
0
1
Bit number
25
26
27
28
29
30
31
32
Bit value
1
0
0
1
0
1
1
1
Table 3. Idle code format
(5) Receive signal duty factor
(6) Error Correction and Detection
During preamble detection, the preamble pattern (1,0) is
recognized at duty factors from 25% (min) to 75% (max)
of the (1,0) preamble cycle.
Item
Description
Preamble Pattern Detection
Selectable 1 to 8 rate errors in 6 to 544 bits
Synchronization Code word Detection
2 random errors in 32 bits
Self Address Code word Detection
2 random errors in 32 bits
Message Code word
1-bit and 2-bit burst errors in 31 bits
Table 4. Error correction
The SM8212B performs error correction (or detection)
on each code word as described in table 4. Note that there
are 8 selectable error correction conditions for the pream-
ble pattern.
An error is deemed to have occurred when 2 or more sig-
nal edges occur within 1-bit unit time, and a rate error is
deemed to have occurred when the number of errors
exceeds the counter value. Refer to the “Preamble Mode”
section for a discussion of the error counter.
In the POCSAG format, for pager systems that send
numeric data, the message information content varies and
as a result an idle signal or another address signal is inserted
after the message to indicate the end of the message.
That is, if no address word or message word exists for a
frame within a batch or for a code word within a frame, the
idle pattern, shown in table 3, is transmitted in its place.
Then during message signal reception, the message ends
when the idle signal is detected.
The SM8212B, however, supports 2 methods of deter-
mining the end of message. Namely, message ends when
either an idle signal or another address is received (POC-
SAG format), or solely by an interrupt signal from the
CPU.
相關(guān)PDF資料 |
PDF描述 |
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| SM8212B | POCSAG Decoder For Multiframe Pagers |
| SM8213 | MINIATURE POWER RELAY |
| SM8213AM | POCSAG Decoder For Multiframe Pagers |
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相關(guān)代理商/技術(shù)參數(shù) |
參數(shù)描述 |
|---|---|
| SM8212B | 制造商:NPC 制造商全稱:Nippon Precision Circuits Inc 功能描述:POCSAG Decoder For Multiframe Pagers |
| SM8213 | 制造商:NPC 制造商全稱:Nippon Precision Circuits Inc 功能描述:POCSAG Decoder For Multiframe Pagers |
| SM8213AM | 制造商:NPC 制造商全稱:Nippon Precision Circuits Inc 功能描述:POCSAG Decoder For Multiframe Pagers |
| SM821C906ZAA | 制造商:AVX Corporation 功能描述:- Bulk |
| SM8220 | 制造商:NPC 制造商全稱:Nippon Precision Circuits Inc 功能描述:Calling Number Identification Receiver IC |
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