
12. CUSTOMER'S BOARD MANIPULATION B-63322EN-2/01
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Save area
The BUFFER AREA boxes indicate the location where data is to be
saved.
In single mode, saving ends once the buffer area is full.
In ring mode, the buffer area is used in a ring manner. When there is no
free space in the buffer area, a new data item is overwritten in the space
occupied by the oldest data item, thus causing the oldest data item to be
discarded.
The unit of discarded old data becomes equal to the total of data saved
in every cycle.
The TOP box displays the address for the next data item to be saved.
The BOTTOM box displays the address for the oldest data item.
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• Examples
Buffer use in single mode
0x02c00000
Space used
Bottom Start of buffer
area
Top
0x02ffffff
Space yet to be
used
End of buffer
area
Buffer use in ring mode
0x02c00000
Space used
Start of buffer
area
Space yet to be
used
Top
Bottom
0x02ffffff
Space used
End of buffer
area