參數(shù)資料
型號(hào)： SM8211
廠商： Seiko NPC Corporation
英文描述： POCSAG Decoder For Pagers
中文描述： POCSAG碼解碼器尋呼機(jī)
文件頁(yè)數(shù)： 6/22頁(yè)
文件大?。?/td> 145K
代理商： SM8211
SM8211M
NIPPON PRECISION CIRCUITS—6
Code words (address and message signals)
Each code word comprises 32 bits as shown in table 2.
Call number to call sign conversion
1. The MSB is the address/message code word control bit. It is 0 for an address signal, and 1 for a message signal.
2. Bits 2 to 21 contain the address or message information.
3. Bits 22 to 31 are BCH(31,21) format generated check bits, where BCH(n,k) = BCH(word length, number of information bits).
4. The LSB is an even-parity bit for bits 1 to 31.
This conversion expands a 7-digit decimal call num-
ber into a 21-bit binary call sign, as shown in figure
2.
After expansion, the high-order 18 bits are assigned
to bits 2 to 19 (address signal), and the low-order 3
bits are the user-defined frame identification pattern,
which is stored in ID-ROM. The two function bits
define which of four call functions is active.
Table 2. Code word format
Code word
Bit number
1 (MSB)
1
2 to 19
2
20, 21
2
22 to 31
3
32 (LSB)
4
Address signal
0
Address bits
Function bits
Check bits
Even-parity bit
Message signal
1
Message bits
Check bits
Even-parity bit
20
21
Function
0
0
A call
0
1
B call
1
0
C call
1
1
D call
Figure 2. Call number to call sign conversion
1
7-digit decimal call
signal (gap code)
Bits 2 to 19 (18 bits)
2
3
4
5
6
7
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
20
21
32
1
Bits 22 to 31 (10 bits)
MSB
LSB
21-bit binary
conversion
Call sign
Frame
identificaton
pattern
Function bits
BCH(31,21) generated check bits
Flag:
0 = address signal
1 = message signal
Even-parity bit
(for bits 1 to 31)
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相關(guān)代理商/技術(shù)參數(shù)
參數(shù)描述
SM8211M 制造商:NPC 制造商全稱:Nippon Precision Circuits Inc 功能描述:POCSAG Decoder For Pagers
SM8212 制造商:NPC 制造商全稱:Nippon Precision Circuits Inc 功能描述:POCSAG Decoder For Multiframe Pagers
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
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