Toggle Bit Flag (Dq6) - Fujitsu F2MC-8FX Hardware Manual

28.5.2

Toggle Bit Flag (DQ6)

The toggle bit flag (DQ6) is a hardware sequence flag used to indicate that the
automatic algorithm is being executed or has been completed using the toggle bit
function.
Toggle Bit Flag (DQ6)
Table 28.5-5 and Table 28.5-6 show the state transition of the toggle bit flag.
Table 28.5-5 State Transition of Toggle Bit Flag (During Normal Operation)
Operating state
DQ6
Table 28.5-6 State Transition of Toggle Bit Flag (During Abnormal Operation)
At programming and chip erasing
• When read access is made continuously during execution of the automatic write algorithm or chip-erase
algorithm, the flash memory toggles the output between "1" and "0" at each read access.
• When read access is made continuously after the automatic write algorithm or chip-erase algorithm is
terminated, the flash memory outputs bit 6 (DATA:6) of the value read from the read address at each
read access.
Programming → Programming completed
Operating state
DQ6
CHAPTER 28 256-KBIT FLASH MEMORY
Toggle → DATA: 6
Programming
Toggle
Chip erasing → Erasing completed
Toggle → Stop
Chip erasing
Toggle
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