Sector Erase Timer Flag (Dq3); Table C.5.4A Status Change Of Sector Erase Tomer Flag (Dq3) - Fujitsu F2MC-16LX MB90580 Series Hardware Manual

C.5 Execution Status of Automatic Algorithm
C.5.4 Sector erase timer flag (DQ3)
Sector erase timer flag is used to indicate whether the Automatic Algorithm is executed beyond the sector
erase wait time after the sector erase command is issued. Table C.5.4a shows status change of the sector
erase timer flag.
• During sector erase operation
An attempt to read access after sector erase command is issued will output "0" to DQ3 if Automatic
Algorithm is executed within the sector erase wait time. "1" will be output to DQ3 if the Automatic Algo-
rithm is executed beyond the sector erase wait time. If the data polling flag or toggle bit flag indicates
that the Automatic Erase Algorithm is operating and DQ3 is "1", internally controlled erasing is started.
Attempts to issue erase code and command other than sector erase suspend to the sector will be
ignored until the erasing is completed. When DQ3 is "0", issuing the additional sector erase code will
be accepted. To ensure the command has been accepted, the control software should check the status
of DQ3 prior to each subsequent sector erase command. If DQ3 was "1" on the status checking, the
command may not be accepted.
• During sector erase suspend
When read accessing during sector erase suspend, "1" will be output to DQ3 if the specified address is
within the sector which is being erased. If it does not within the sector being erased, the flash memory
will output the value of bit 3 (DATA:3) at the address specified by the current address signals.
• Status Change in normal operation
Operation Programming
→ complete
status
0 → DATA:3
DQ3
• Status Change in abnormal operation
Operation Programming
Status Operation
DQ3 0
366 Appendix C: The Flash Memory in the MB90F583
Table C.5.4a Status Change of sector erase timer flag (DQ3)
Chip/sector erase Sector erase wait
→ complete
0 → 1
1
Chip/sector
erase operation
1
Sector erase
→ suspend
→ start
(Sector being
erased)
1 → 0
Sector erase
Sector erase suspend
being suspended
→ resume
(Sector not being
(Sector being erased)
0 → 1
MB90580 Series
erased)
DATA:3