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參數(shù)資料
| 型號： | PCD5013H |
| 廠商： | NXP SEMICONDUCTORS |
| 元件分類： | 尋呼電路 |
| 英文描述： | FLEX roaming decoder II |
| 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)： | 58/76頁 |
| 文件大?。?/td> | 270K |
| 代理商： | PCD5013H |
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1999 Apr 12
58
Philips Semiconductors
Product specification
FLEX
roaming decoder II
PCD5013
8.8.5
T
EMPORARY ADDRESSES
FLEX
allows dynamic group calls in which a common
message is sent to a group of paging devices. This is
achieved by assigning the same temporary address (TA)
to each pager in the group using the pagers’ personal
addresses and the short instruction vector. The short
instruction vector causes the TA to be active in the next
occurrence of a specific frame (if the designated frame is
equal to the present frame the host is to interpret this as
the next occurrence of this frame in the following cycle).
FLEX
specifies sixteen TAs which remain valid for one
message starting in the specified frame and remaining
valid throughout the following frames to the completion of
the message. The FLEX
protocol restricts the placement
of TAs such that once assigned to a specific frame they
cannot occur in the FLEX
transmission before that
frame.
The PCD5013 uses AFM (Section 8.8.4) to allow the
reception of TAs outside programmed frames.
The sequence for the host and the PCD5013 to operate
a TA is:
1.
The PCD5013 receives an address codeword followed
by a vector codeword with
V
2
V
1
V
0
= 001 and I
2
I
1
I
0
= 000 indicating a short
instruction vector which assigns a TA to this pager.
2.
The PCD5013 passes the address and vector
codeword to the host as packets and increments the
corresponding TA counter and enters AFM.
3.
The host examines the vector packet to identify
which TA is assigned and the frame in which the TA is
expected.
The PCD5013 continues to decode all of the frames
and passes any address information, vector
information and message information to the host
followed by a status packet indicating the end of each
frame and the current frame number.
The host processes data packets received while the
PCD5013 is in AFM. It uses the AFM packet to
decrement the appropriate TA counter when no further
data can be expected for the corresponding TA. This
occurs when:
a) The TA is not found in the assigned frame.
b) The TA is found in the frame it was assigned and
was not a fragmented message.
c) The TA is found in the assigned frame was a
fragmented message and the rules for message
fragmentation (Section 8.8.6) indicate that no
further data can be expected. In this case the host
must send an AFM packet with both the DAF and
the appropriate DTA bits set in order to terminate
both the fragmented message and the TA.
The above operation is repeated for every enabled TA.
4.
5.
6.
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