m28w640fcb STMicroelectronics, m28w640fcb Datasheet - Page 70

• Manufacturer Part Number: m28w640fcb
• Description: 64 Mbit 4mb X16, Boot Block 3v Supply Flash Memory
• Manufacturer: STMicroelectronics

Flowcharts and pseudo codes
Figure 22. Locking Operations flowchart and pseudo code
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01h, D0h or 2Fh
Read Block
Lock States
confirmed?
Write 60h
Write 90h
Write FFh
Locking
change
Write
Start
End
YES
NO
locking_operation_command (address, lock_operation) {
}
writeToFlash (any_address, 0xFF) ; /*Reset to Read Array mode*/
writeToFlash (any_address, 0x60) ; /*configuration setup*/
if (lock_operation==LOCK) /*to protect the block*/
else if (lock_operation==UNLOCK) /*to unprotect the block*/
else if (lock_operation==LOCK-DOWN) /*to lock the block*/
if (readFlash (address) ! = locking_state_expected)
writeToFlash (address, 0x01) ;
writeToFlash (address, 0xD0) ;
writeToFlash (address, 0x2F) ;
writeToFlash (any_address, 0x90) ;
/*Check the locking state (see Read Block Signature table )*/
error_handler () ;
M28W640FCT, M28W640FCB
AI04364