Timing Limit Excess Flag (Dq5) - Fujitsu F2MC-16LX Hardware Manual

23.6.3 Timing Limit Excess Flag (DQ5)

The timing limit excess flag (DQ5) informs the operator that the automatic algorithm
execution exceeded the time specified within the flash memory (number of internal
pulses).
■ Timing Limit Excess Flag (DQ5)
Table 23.6-7 and Table 23.6-8 show status transitions of the timing limit excess flag.
Table 23.6-7 Status Transition of The Timing Limit Excess Flag (Status Changes at Normal Operation)
Operation Writing -->
status completion
0 -->
DQ5
DATA:5
Table 23.6-8 Status Transition of the Timing Limit Excess Flag (Status Changes at
Operation status
❍ At writing or chip or sector deletion
Assume that a read access is made after the automatic algorithm for the writing or chip or sector
deletion is activated. The flag outputs "0" when the automatic algorithm execution is within the
specified time (required for writing or deletion).
execution exceeds the specified time. This output does not depend on whether the automatic
algorithm is being executed or ends; therefore, the operator can determine whether the writing
or deletion is successful. In other words, if this flag is "1", and the automatic algorithm is being
executed by the data polling function or toggle bit function, the operator is able to recognize that
the writing has failed.
For example, if an attempt is made to write "1" in the flash memory address in which "0" is
already written, a fail occurs. In this case, the flash memory is locked and the automatic
algorithm does not end. Therefore, no valid data is output from the data polling flag (DQ7). The
toggle bit flag (DQ6) does not stop the toggle operation and the time limit is exceeded. The
timing limit excess flag (DQ5) outputs "1". This status indicates that the flash memory is not
faulty and that it was not used correctly. If this status occurs, execute the reset command.
23.6 Confirming the Automatic Algorithm Execution Status
Chip or Sector
sector deletion
deletion -->
wait
completion --> start
0 --> 1 0
Abnormal Operation)
DQ5
Temporary
Sector deletion
stop of sector
--> temporary
deletion -->
stop of deletion
restart
Sector being
Sector being
deleted
deleted
0
Writing
1
It outputs "1" if the automatic algorithm
Temporary
stop of sector
deletion
ongoing
Sector not
being deleted
0 DATA:5
Chip or sector deletion
1
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