Toggle Bit Flag (Dq6); Table C.5.2A Status Change Of Toggle Bit Flag (Dq6) - Fujitsu F2MC-16LX MB90580 Series Hardware Manual

C.5 Execution Status of Automatic Algorithm
C.5.2 Toggle bit flag (DQ6)
Toggle bit flag is used to indicate whether the Automatic Algorithm is in progress or is completed by using
toggle bit function. Table C.5.2a shows status change of the toggle bit flag.
• Programming, Chip and Sector Erase
During Automatic Program or Erase Algorithm, successive attempts to read access to the flash memory
will result in toggling DQ6 between "1" and "0". When Automatic Program Algorithm and Automatic
Chip/Sector Erase Algorithm is completed and continuous read access is attempted, the flash memory
will stop the DQ6 toggling and output the value of bit 6 of the address specified by the current address
signals.
• Sector Erase Suspend
When an attempt to read access in sector erase suspend mode, read value will be "1" if the address is
specified within the sector being sector erased. If the specified address is not within to the sector being
sector erased, the flash memory will output the value of bit 6 of the address specified by the current
address signals.
Note: In programming operation, if the sector to be programmed is write-protected, the DQ6 will be tog-
gled for about 2 µS and then stop toggling without having the data change. In erasing operation, if
all sectors are write-protected, the DQ6 will be toggled for about 100 µS and then go back into
read/reset mode without having the data change.
• Status Change in normal operation
Operation Programming
→ complete
status
Toggle → DATA:6
DQ6
• Status Change in abnormal operation
Operation Programming
Status Operation
DQ6 Toggle
364 Appendix C: The Flash Memory in the MB90F583

Table C.5.2a Status Change of toggle bit flag (DQ6)

Chip/sector erase Sector erase wait
→ complete
Toggle → Stop
Toggle
Chip/sector
erase operation
Toggle
Sector erase
→ suspend
→ start
(Sector being
erased)
Toggle → 1
Sector erase
Sector erase suspend
being suspended
→ resume
(Sector not being
(Sector being erased)
1 → Toggle
MB90580 Series
erased)
DATA:6