參數(shù)資料
型號(hào)： PCF5001T
廠商： NXP SEMICONDUCTORS
元件分類： 尋呼電路
英文描述： POCSAG Paging Decoder
中文描述： TELECOM, PAGING DECODER, PDSO28
封裝： 7.50 MM, PLASTIC, MS-013AE, SOT-136-1, SOP-28
文件頁數(shù)： 13/44頁
文件大小： 273K
代理商： PCF5001T
1997 Mar 04
13
Philips Semiconductors
Product specification
POCSAG Paging Decoder
PCF5001
This is carried out for the duration of 3 batches in
power-on
mode or 1 batch (=preamble duration) in
preamble receive
mode. Error correction algorithms are
applied to the data before it is compared with preamble
and synchronization codeword patterns.
The synchronization process is terminated and thus
data receive
mode is entered as soon as synchronization
codewords are seen at the beginning of each batch.
The decoder handles loss of synchronization in three
steps:
1.
If the decoder fails to detect the synchronization
pattern at the beginning of the current batch it
continues data reception as normal. This
data fail
mode is signalled in the message output when an
address codeword was received, as shown in Table 4.
2.
If also at the beginning of the next batch no
synchronization codeword can be detected, the
algorithm assumes a small bit shift in the
fade recovery
mode and performs more
synchronization codeword checks around the
expected position for the following 15 batches. Call
reception is suspended.
3.
If it fails to re-synchronize in the ‘fade recovery’ mode,
the
carrier off
mode is selected, in which the decoder
attempts to regain synchronization by bit-wise shifting
its synchronization scan window. Using this technique
re-synchronization is obtained within a continuous
data stream of at least 18 batches without preamble
detection.
In ‘data receive’ mode, the input data stream is sampled at
the synchronization codeword position and the
programmed frame positions. The received codewords are
error corrected and then, if address codewords, compared
with the stored user addresses related to that frame.
On detection of a valid call, the decoder performs the
following three operations:
1.
Set a store for call alert cadence generation according
to the combination of the function bits in the accepted
address codeword. The call alert cadence will not be
generated before the call has been terminated.
2.
Keep the receiver enable output (RE) active and
receive subsequent message codewords, until any of
the call termination criteria are fulfilled.
3.
Trigger the serial message transfer by sending a start
condition and transfer deformatted message
codewords as attached to the address codeword via
the serial microcontroller interface to an external
microcontroller, followed by a stop condition.
Normally call termination is assumed, when a valid idle or
address codeword is received. On reception of
uncorrectable codewords, call termination takes place in
accordance with conditions shown in Table 2.
Table 2
Call termination on error
Note
1.
X = don’t care.
SPF12
SPF13
X
(1)
CALL TERMINATION EVENT
0
Any two consecutive codewords or the codeword directly following the address
codeword uncorrectable.
Any single codeword uncorrectable.
Any two consecutive codewords uncorrectable.
1
1
0
1
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