參數(shù)資料
型號(hào)： PCD5003
廠(chǎng)商： NXP Semiconductors N.V.
英文描述： Advanced POCSAG Paging Decoder
中文描述： 高級(jí)尋呼POCSAG碼解碼器
文件頁(yè)數(shù)： 7/44頁(yè)
文件大?。?/td> 187K
代理商： PCD5003
1997 Jun 24
7
Philips Semiconductors
Product specification
Advanced POCSAG Paging Decoder
PCD5003
Alert-only calls only consist of a single address codeword.
Numeric and alphanumeric calls have message
codewords following the address. A message causes the
frame structure to be temporarily suspended. Message
codewords are sent until the message is completed, with
only the sync words being transmitted in their expected
positions.
Message
codewords 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 codeword 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 codeword.
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 PCD5003. Message data is not
deformatted.
Table 1
POCSAG recommended call types and function bits
BIT 20 (MSB)
BIT 21 (LSB)
CALL TYPE
DATA FORMAT
0
0
1
1
0
1
0
1
numeric
alert only 1
alert only 2
alphanumeric
4-bits per digit
7-bits per ASCII character
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
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