Notes On Flash Memory Program/Erase; Read/Reset Status - Fujitsu F2MC-16LX MB90580 Series Hardware Manual

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C.6 Details of Flash Memory Programming/Erasing
This section describes the following: command generated for initiating Automatic Algorithm, read/reset of
flash memory, programming, chip erase, sector erase suspend and sector erase resume.
Flash memory can execute Automatic Algorithm when repeating the bus write cycle in read/reset, pro-
gramming, chip erase, sector erase, sector erase suspend and sector erase resume command sequence.
The bus write cycle must be sent continuously. Completion of the Automatic Algorithm can be determined
by checking the hardware sequence flag such as data polling function. If it is completed correctly, the flash
memory will return to read/reset status.
C.6.1 Read/reset status
This section describes how to isssue read/reset command to make flash memory returning to read/reset
status.
To make the flash memory returning to read/reset status, the command sequence of the read/reset
command found in command sequence table (refer to Section C.4, Automatic Algorithm Initiation Method,
Table C.4a) can be used and it needs to be continuously sent to the target sector in the flash memory.
There are two kinds of bus write cycles in read/reset command, 1 and 3 bus write cycles, but there are no
significant difference between them.
Since read/reset is the initial state, the flash memory will always go to this state when power-on and any
command is correctly implemented. Read/reset status is a waiting state for other command. Normal read
access can be done in the read/reset status.
Programming access is possible from the CPU. This command is not necessary for reading data in normal
read access. This command is used when the operation is not completed correctly for some reasons, or
when automatic algorithm needs to be reseted.
MB90580 Series
C.6 Details of Flash Memory Programming/Erasing
Appendix C: The Flash Memory in the MB90F583
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