參數(shù)資料
型號(hào)： KS8701
廠商： SAMSUNG SEMICONDUCTOR CO. LTD.
英文描述： FLEXTM Roaming Decoder II
中文描述： FLEXTM漫游解碼器二
文件頁(yè)數(shù)： 65/73頁(yè)
文件大小： 434K
代理商： KS8701
Appendix A: Application Notes
KS8701
64
FLEX
TM
Roaming Decoder II
OPERATION OF A TEMPORARY ADDRESS
GROUP MESSAGING
The FLEX protocol allows for a dynamic group call for the purpose of sending a common message to a group
of paging devices. The dynamic group call approach assigns a
“
Temporary Address
”
using the personal address
and the short instruction vector.
The FLEX protocol specifies sixteen addresses for the dynamic group call which may be temporarily activated
in a future frame (If the frame or one of the frames designated is equal to the present frame the host is to interpret
this as the next occurrence of this frame 4 minutes in the future.) The temporary address is valid for one message
starting in the specified frame(s) and remaining valid throughout the following frames to the completion of the
message. If the message is not found in the specified frame(s) the host must disable the assigned temporary
address.
The following describes the sequence of events between the Host and the KS8701 required to handle a
temporary address:
l
Following an Address Packet, the host will receive a Vector Packet with
V
2
V
1
V
0
= 001 and
i
2
i
1
i
0
= 000 or
010 (a Short Instruction Vector indicating a temporary address has been assigned to this pager). The
system may send either
i
2
i
1
i
0
= 000 or
i
2
i
1
i
0
= 010 or both when assigning a temporary address. The vector
packet with
i
2
i
1
i
0
= 000 will indicate which temporary address is assigned and the frame in which the
temporary address is expected. The vector packet with
i
2
i
1
i
0
=010 will indicate which temporary address is
assigned, the MSb of the expected frame (essentially indicating 64 frames in which to look for the
temporary address), and a message sequence number. When the vector packet with
i
2
i
1
i
0
= 010 is
received on a long address, the specific assign frame is included in the message word sent after the
vector
l
The KS8701 will increment the corresponding temporary address counter for each temporary address
assignment vector received and begin to decode all of the following frames. Note that this implies a single
dynamic group assignment that is implemented by sending two short instructions ( one for each temporary
address assignment mode of the short instruction vector) will cause the corresponding temporary address
counter to increment twice.
l
The KS8701 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.
l
There are several scenarios which may occur with temporary addresses
1.
The temporary address is not found in the any of the assigned frames and therefore the host must
terminate the temporary address mode by sending an All Frame Mode Packet to the KS8701 with the
“
DTA
”
bit of the particular temporary address set. (if both temporary address assignment packets
were used to assign the temporary address, the
“
DTA
”
bit must be set twice to disable the temporary
address)
2.
The temporary address is found in the frame it was assigned and was not a fragmented message.
Again, the host must terminate the temporary address mode by sending an All Frame Mode Packet
to the KS8701 with the
“
DTA
”
bit of the particular temporary address set.(if both temporary address
assignment packets were used to assign the temporary address, the
“
DTA
”
bit must be set twice to
disable the temporary address)
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