M28W640 STMicroelectronics, M28W640 Datasheet - Page 50

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M28W640

Manufacturer Part Number
M28W640
Description
64 Mbit 4Mb x16/ Boot Block 3V Supply Flash Memory
Manufacturer
STMicroelectronics
Datasheet

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M28W640CT, M28W640CB
Figure 23. Locking Operations Flowchart and Pseudo Code
50/54
01h, D0h or 2Fh
Read Block
Lock States
confirmed?
Write FFh
Write 60h
Write 90h
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 () ;
AI04364

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