Fujitsu MB90460 Series, Hardware Manual, Page: 616 / 739

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CHAPTER 23 512K / 1024K BIT FLASH MEMORY
23.5.2 Toggle Bit Flag (DQ6)
The toggle bit flag specifies whether the automatic algorithm is being executed or has
been terminated, using the toggle bit function, the same as the data polling flag. Table
23.5-4 shows the toggle bit flag status transition.
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When the Write Operation or Chip/Sector Deletion Operation is Executed.
When the continuous read/access is executed during the automatic write algorithm or chip/sector deletion
algorithm execution, the flash memory outputs the toggle status, in which "1" and "0" are alternately output
for each read operation, irrespective of the specified address. If the continuous read/access is executed at
the end of the automatic write algorithm or chip/sector deletion algorithm, the flash memory stops the
toggle operation in bit6 and outputs the data of bit6 (DATA:6) in the specified read address.
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When the Sector Deletion Temporary Stop is Executed.
When the read/access is executed while executing the sector deletion temporary stop, the flash memory
outputs "1" if the specified address belongs to the sector being deleted. The flash memory outputs the data
of bit6 (DATA:6) in the specified read address unless the specified address belongs to the sector being
deleted.
Reference:
When executing the write operation, the toggle bit executes the toggle operation for about 2 ms, then
terminates it without rewriting the data, if the sector to be written is write-protected.
When executing the deletion operation, the toggle bit executes the toggle operation for about 100
ms, then returns to the read/reset status without rewriting the data, if all the selected sectors are
protected from rewriting.
Toggle Bit Flag Status Transition
Table 23.5-4 Toggle Bit Flag Status Transition
Oper a ting
s t a t us
Write oper a tion
--> Completion
Chip/ s ector
deletion
-->Completion
S ector deletion
w a it--> S t a rt
DQ6
Toggle DATA:6
S ector deletion
tempor a ry s top
-->Re s t a rt
( S ector b eing
deleted)
D u ring the s ector
deletion tempor a ry
s top ( S ector not
S ector deletion
-->Deletion
tempor
a ry s top
( S ector b eing
deleted)
Oper a ting s t a t us Write oper a tion
Chip/ s ector deletion oper a tion
DQ6
- S t a t us tr a n s ition d u ring ab norm a l oper a tion
- S t a t us tr a n s ition d u ring norm a l oper a tion
Toggle
-->DATA:6
Toggle--> S top
Toggle-->1
1-->Toggle
Toggle
Toggle
b eing deleted)