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參數(shù)資料
| 型號(hào)： | 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)： | 62/76頁 |
| 文件大?。?/td> | 270K |
| 代理商： | PCD5013H |
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1999 Apr 12
62
Philips Semiconductors
Product specification
FLEX
roaming decoder II
PCD5013
8.8.9
U
SING THE
R
ECEIVER
S
HUTDOWN
P
ACKET
8.8.9.1
Operation of Roaming features
A roaming pager scans channels in a frequency list to
determine the channel or channels to monitor. The pager
matches the Roaming IDs (SSIDs, NIDs or any IDs)
transmitted on monitored channels against those
contained in the pager’s Roaming ID list. Each item in the
Roaming ID list is assigned a priority to ensure
determinative behaviour for roaming pagers.
Implementation of a Roaming Pager using the PCD5013 is
greatly simplified using the FLEX
software.
Items in the Roaming ID list are assigned priorities to
arbitrate in the case where a pager is in a coverage in
which there is more than one RF channel. In the case that
a pager receives data from two channels both of Roaming
Identifiers of the highest priority, it can enter one of two
modes of operation (as determined by the pager
programming).
Channel scanning is done to determine whether to switch
channel because there is a channel of higher priority than
the currently monitored channel.
Global scanning: the scan of all RF channels after switch
on. Once the global scan is completed, the pager starts
to monitor all channels with a programmed priority which
is equal to or higher than the highest priority channel on
which a FLEX
transmission was encountered. If no
FLEX
transmission is encountered the pager must
restart the global scan after some battery saving period.
Background scanning: scanning done to determine
whether the pager one of the monitored RF channels
carries a FLEX
signal with higher priority than the
currently monitored channel.
This can occur either because the pager has entered a
new area or because the Roaming IDs or Traffic
Management Flags change.
A pager can stop monitoring a channel either because
the channel’s Roaming ID changes or because no signal
has been encountered on the channel for a given period.
When all the monitored channels have been lost, the
pager must start a global scan.
The PCD5013 sends information to the host in the
Receiver Shutdown Packet (see Section 8.4.12) every
time it shuts the receiver down. This allows the host to
calculate whether it will have enough time to switch
frequencies before the receiver next switches on
(see Section 8.8.9.2).
The PCD5013 allows the identification of Roaming IDs
by the support for the reception of SSID Block
Information words and Short Messaging Vectors
(see Sections 8.7.5 and 8.7.9)
8.8.9.2
Calculating time left
The receiver shutdown packet gives timing information to
the host. Two times are of particular interest when
implementing a roaming algorithm.
TimeToWarmUpStart:
Defined as the amount of time
there is before the receiver starts to warm-up (i.e.
transition from the off state to the first warm-up state).
TimeToTasksDisabled:
Defined as the amount of time
the host has to complete any host initiated tasks (e.g. by
setting SND or SAS in the roaming control packet).
The formulae for calculating these times are shown below
and depend on whether the PCD5013 is in Synchronous
mode or Asynchronous mode.
Synchronous mode:
Asynchronous mode:
Where:
TNF (Time to Next Frame): value from the receiver shutdown packet. SkippedFrames: the number of frames that will not
be decoded. Calculated from the Current Frame (CF) and Next Needed Frame (NAF) fields in the receiver shutdown
packet (e.g. if CF is 10 and NAF is 12, then SkippedFrames is 1). ReceiverOffTime: the time programmed in the receiver
off setting packet.
TimeToWarmupStart
TNF
80 ms
×
(
)
SkippedFrames
1874.375 ms
×
(
)
ReceiverOffTime
167.5 ms
–
(
)
+
+
≥
TimeToTasksDisabled
TNF
80 ms
×
(
)
SkippedFrames
1874.375 ms
×
(
)
ReceiverOffTime
247.5 ms
–
(
)
+
+
≥
TimeToWarmupStart
TNF
2
–
(
)
80 ms
×
[
]
ReceiverOffTime
+
≥
TimeToTasksDisabled
TNF
3
–
(
)
80 ms
×
[
]
≥
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