Toggle Bit Flag (Dq6) - Fujitsu MB90335 Series Hardware Manual

CHAPTER 22 DUAL OPERATION FLASH MEMORY
22.6 Check the Execution State of Automatic Algorithm
22.6.2

Toggle Bit Flag (DQ6)

The toggle bit flag is a hardware sequence flag used to notify that the automatic
algorithm is being executed or in the end state using the toggle bit function.
■ Toggle Bit Flag (DQ6)
Table 22.6-5 and Table 22.6-6 give the state transition of the toggle bit flag.
Table 22.6-5 State Transition of Toggle Bit Flag (State Change at Normal Operation)
Programming
Operating State
→
Completed
Toggle
DQ6
DATA:6
Table 22.6-6 State Transition of Toggle Bit Flag (State Change at Abnormal Operation)
Operating State
DQ6
●
At programming and chip/sector erasing
• If a continuous read access is made during the execution of the automatic algorithm for programming
and chip erasing/sector erasing, flash memory toggle-outputs "1" and "0" alternately every reading.
• If a continuous read access is made after the completion of the automatic algorithm for programming
and chip erasing/sector erasing, flash memory outputs bit6 (DATA: 6) for the read value of the read
address every reading.
●
At sector erasing suspension
If a read access is made in the sector erasing suspension state, flash memory outputs "1" when the read
address is the sector being erased and bit6 (DATA: 6) for the read value of the read address when the read
address is not the sector being erased.
Note:
When the flash memory writing control program is executed by using the function of the dual
operation flash memory on the flash memory, the state write/erasing it with toggle bit flag (DQ6)
cannot be confirmed.
This notes do not correspond when the flash memory writing control program is executed on RAM.
498
Chip and Sector
Wait for Sector
→
Erasing
Erasing
Erasing
Erasing Started
Completed
→
→
Toggle Stop
FUJITSU MICROELECTRONICS LIMITED
Sector Erasing
→
Erasing
→
Suspended
(Sector being
Erased)
→
Toggle
Toggle
Programming
Toggle
MB90335 Series
Sector Erasing Sector Erasing
→
Suspended
Suspended
(Sector not
Resume
being Erased)
(Sector being
Erased)
→
1
1 Toggle
Chip and Sector Erasing
Toggle
CM44-10137-6E
DATA:6