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參數(shù)資料
| 型號(hào)： | PCD5003A |
| 廠商： | NXP Semiconductors N.V. |
| 英文描述： | Enhanced Pager Decoder for POCSAG |
| 中文描述： | 增強(qiáng)傳呼機(jī)POCSAG碼解碼器 |
| 文件頁數(shù)： | 7/44頁 |
| 文件大小： | 233K |
| 代理商： | PCD5003A |
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1999 Jan 08
7
Philips Semiconductors
Product specification
Enhanced Pager Decoder for POCSAG
PCD5003A
Alert-only calls only consist of a single address code-word.
Numeric and alphanumeric calls have message
code-words following the address. A message causes the
frame structure to be temporarily suspended. Message
code-words are sent until the message is completed, with
only the sync words being transmitted in their expected
positions.
Message
code-words are identified by an MSB of logic 1
and are coded as shown in Fig.3. The message
information is stored in a 20-bit field (bits 2 to 21). The data
format is determined by the call type: 4 bits per digit for
numeric messages and 7 bits per (ASCII) character for
alphanumeric messages.
Each code-word is protected against transmission errors
by 10 CRC check bits (bits 22 to 31) and an even-parity bit
(bit 32). This permits correction of maximum 2 random
errors or up to 3 errors in a burst of 4 bits (a 4-bit burst
error) per code-word.
The POCSAG standard recommends the use of
combinations of data formats and function bits, as given in
Table 1. Other (non-standard) combinations will be
received normally by the PCD5003A. Message data is not
deformatted.
In the PCD5003A error correction methods have been
implemented as shown in Table 2.
Random error correction is default for both address and
message code-words. In addition, burst error correction
can be enabled by SPF programming. Up to 3 erroneous
bits in a 4-bit burst can be corrected.
The error type detected for each code-word is identified in
the message data output to the microcontroller, allowing
rejection of calls with too many errors.
Fig.3 POCSAG code structure.
handbook, full pagewidth
PREAMBLE
BATCH 1
BATCH 2
BATCH 3
LAST BATCH
SYNC | CW CW | CW CW | . . . . . | CW CW
FRAME 0
FRAME 1
FRAME 7
10101 . . . 10101010
Address code-word
Message code-word
0
18-bit address
2 function bits
10 CRC bits
P
1
20-bit message
10 CRC bits
P
MCD456
相關(guān)PDF資料 |
PDF描述 |
|---|---|
| PCD5003AH | Enhanced Pager Decoder for POCSAG |
| PCD5003 | Advanced POCSAG Paging Decoder |
| PCD5003H | Advanced POCSAG Paging Decoder |
| PCD5008 | FLEX Pager Decoder |
| PCD5008H | FLEX Pager Decoder |
相關(guān)代理商/技術(shù)參數(shù) |
參數(shù)描述 |
|---|---|
| PCD5003AH | 制造商:PHILIPS 制造商全稱:NXP Semiconductors 功能描述:Enhanced Pager Decoder for POCSAG |
| PCD5003H | 制造商:PHILIPS 制造商全稱:NXP Semiconductors 功能描述:Advanced POCSAG Paging Decoder |
| PCD5003HB-T | 制造商:未知廠家 制造商全稱:未知廠家 功能描述:Telecommunication Decoder |
| PCD5003U/10 | 制造商:PHILIPS 制造商全稱:NXP Semiconductors 功能描述:Advanced POCSAG Paging Decoder |
| PCD5008 | 制造商:PHILIPS 制造商全稱:NXP Semiconductors 功能描述:FLEX Pager Decoder |
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