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參數(shù)資料
| 型號： | PCD5002H |
| 廠商： | NXP SEMICONDUCTORS |
| 元件分類： | 尋呼電路 |
| 英文描述： | Advanced POCSAG and APOC-1 Paging Decoder |
| 中文描述： | TELECOM, PAGING DECODER, PQFP32 |
| 封裝： | 7 X 7 MM, 1.40 MM HEIGHT, PLASTIC, SOT-358-1, LQFP-32 |
| 文件頁數(shù)： | 15/48頁 |
| 文件大?。?/td> | 203K |
| 代理商： | PCD5002H |
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1997 Jun 24
15
Philips Semiconductors
Product specification
Advanced POCSAG and APOC-1 Paging
Decoder
PCD5002
Table 10
Call terminator bit identification
Note
1.
The DF bit in the call terminator is set:
a) When any call data codeword in the terminating batch was uncorrectable, while in ‘data receive’ mode.
b) When the sync word at the start of the terminating batch did not match the standard POCSAG or a
user-programmed sync word, while in ‘data fail’ mode.
Table 11
Error type identification (note 1)
Note
1.
POCSAG code allows a maximum of 3 bit errors to be detected per codeword.
BITS (MSB to LSB)
IDENTIFICATION
FT
forced call termination (1 = yes)
identifier number of last sync word
data fail mode indication (1 = data fail mode); note 1
function bits of received address codeword (bits 20 and 21)
detected error type; see Table 11; E3 = 0 in a call terminator
S3 to S1
DF
F0 and F1
E3 to E1
E3
E2
E1
ERROR TYPE
NUMBER OF ERRORS
0
0
0
0
1
1
1
1
0
0
1
1
0
0
1
1
0
1
0
1
0
1
0
1
no errors - correct codeword
parity bit in error
single bit error
single bit error and parity error
not used
4-bit burst error and parity error
2-bit random error
uncorrectable codeword
0
1
1 + parity
1
3 (e.g.1101)
2
3 or more
Successful call termination occurs on reception of a valid
address codeword with less than 2 bit errors.
Unsuccessful termination occurs when a sync word is not
detected while in the ‘data fail’ mode.
It is generally possible to distinguish these two conditions
using the sync word identifier number (bits S3 to S1); the
identifier number will be non-zero for correct termination,
and zero for sync word failure.
Only when a call is received in the ‘data fail’ mode and the
call is terminated before the end of the batch, is it not
possible to distinguish unsuccessful from successful
termination.
Reception of message data can be terminated at any time
by transmitting a forced call termination command to the
status register via the I
2
C-bus. Any call received will then
be terminated immediately and the ‘data fail’ mode will be
entered.
8.19
Continuous data decoding
Apart from transmissions in the POCSAG or APOC-1
format, the PCD5002 is also capable of decoding
continuous transmissions with the same codeword
structure. Any user-programmable sync word (UPSW)
may be designated to enable continuous data decoding.
When a Continuous Data Decoding (CDD) sync word is
detected at any sync word position, the receiver remains
enabled from then on. Status bits D1 and D0 show the
CDD mode to be active.
All codewords are decoded and their data fields are stored
in SRAM. The usual error information is appended. No
distinction is made between address and message
codewords: codeword bit 0 is treated as a data bit and is
stored in bit M1 of the 3-byte output format.
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