- 您現在的位置：買賣IC網 > PDF目錄382380 > PCD5008H (NXP SEMICONDUCTORS) FLEX Pager Decoder PDF資料下載
參數資料
| 型號： | PCD5008H |
| 廠商： | NXP SEMICONDUCTORS |
| 元件分類： | 尋呼電路 |
| 英文描述： | FLEX Pager 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： | 50/64頁 |
| 文件大小： | 341K |
| 代理商： | PCD5008H |
第1頁第2頁第3頁第4頁第5頁第6頁第7頁第8頁第9頁第10頁第11頁第12頁第13頁第14頁第15頁第16頁第17頁第18頁第19頁第20頁第21頁第22頁第23頁第24頁第25頁第26頁第27頁第28頁第29頁第30頁第31頁第32頁第33頁第34頁第35頁第36頁第37頁第38頁第39頁第40頁第41頁第42頁第43頁第44頁第45頁第46頁第47頁第48頁第49頁當前第50頁第51頁第52頁第53頁第54頁第55頁第56頁第57頁第58頁第59頁第60頁第61頁第62頁第63頁第64頁
1998 Jun 17
50
Philips Semiconductors
Product specification
FLEX
Pager Decoder
PCD5008
8.8.4
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 PCD5008 uses AFM (Section 8.8.3) to allow the
reception of TAs outside programmed frames.
The sequence for the host and the PCD5008 to operate
a TA is:
1.
The PCD5008 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 PCD5008 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 PCD5008 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
PCD5008 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 8.8.5) 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.
相關PDF資料 |
PDF描述 |
|---|---|
| PCD5013 | FLEX roaming decoder II |
| PCD5013H | FLEX roaming decoder II |
| PCD5032 | ADPCM CODEC for digital cordless telephones |
| PCD5032H | ADPCM CODEC for digital cordless telephones |
| PCD5032T | ADPCM CODEC for digital cordless telephones |
相關代理商/技術參數 |
參數描述 |
|---|---|
| PCD5008HBD-T | 制造商:未知廠家 制造商全稱:未知廠家 功能描述:Telecommunication Decoder |
| PCD5013 | 制造商:PHILIPS 制造商全稱:NXP Semiconductors 功能描述:FLEX roaming decoder II |
| PCD5013H | 制造商:PHILIPS 制造商全稱:NXP Semiconductors 功能描述:FLEX roaming decoder II |
| PCD5032 | 制造商:PHILIPS 制造商全稱:NXP Semiconductors 功能描述:ADPCM CODEC for digital cordless telephones |
| PCD5032B | 制造商:未知廠家 制造商全稱:未知廠家 功能描述:Linear CODEC |
發布緊急采購，3分鐘左右您將得到回復。