參數(shù)資料
型號(hào)： LC72714W
廠商： SANYO SEMICONDUCTOR CO LTD
元件分類： 消費(fèi)家電
英文描述： SPECIALTY CONSUMER CIRCUIT, PQFP64
封裝： 10 X 10 MM, SQFP-64
文件頁(yè)數(shù)： 18/29頁(yè)
文件大小： 201K
代理商： LC72714W
LC72714W
No.6871-25/29
In figure 6, it is also possible to see the period
timing that caused the incorrect synchronization
with a timing other than that for station A to be a
sub-reception station completely separate from
station A, referred to here as station B. This IC is
thus able, in this manner, to acquire data from
both stations when the tuning is switched between
station A and station B without any special control
operations. In this case, it is necessary for there
to be temporary block synchronization with
station B, and this allows us to apply this
operation to the case of data reception for VICS
data (main station A) and dGPS data (sub-station
B). In figure 6, the temporarily received data for
station B can be acquired as post-horizontal
correction output data, which is a real-time
output, and the station A data can be acquired as
fully decoded data in the post-vertical correction
data.
Control method
This section presents an example of a possible flow of control.
First, the application detects the frame phase difference between the VICS station and the dGPS station, and then sets
the tuning control start timing based on that phase difference. The frame synchronization forward protection count is
set to at least 3, and the block synchronization back protection count is set to 2. Since BLK_RST, which only resets
the block synchronization circuit, is used, there is no need to modify the block synchronization forward protection
count.
Note that these settings can be replaced by the default settings used by this IC.
When the BLK_RST is cleared after tuning the dGPS station, the IC starts block synchronization pull in, and after the
time corresponding to the block synchronization back protection count has passed, block synchronization with the
dGPS station data will be established. The post-horizontal correction output data (data for which status bit 7 (VH) is 0)
that is output from this point will be data received from the dGPS station.
After acquiring the stipulated number of packets of data, the application sets BLK_RST valid again, and tunes back to
the VICS station. If the dGPS station reception conditions are unluckily unfavorable, it will not be possible to establish
block synchronization, or it may not be possible to acquire fully corrected packet data. However, even if such
conditions occur, the receiver must tune back to the VICS station after receiving the stipulated number of packets of
data. The reason is that if the receiver did not do so, it would become impossible to completely decode the data in
vertical correction for the VICS station itself, which is the main station being received. Since the ability of vertical
correction to correct burst errors is about 10 packets, this sequence of tuning and data acquisition operations must
completed within 10 packets. If that condition is met, it will be possible to decode the VICS station data. However, this
is only possible when there are no packets that cannot be corrected other than those missed during the sequence of the
simultaneous reception processing.
Main
reception
station A
Incorrectly
synchronized
station
or
Sub-reception
station B
Figure 6 Main Reception Station and Sub-Reception Station
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