M28W160C70ZB6F View Datasheet(PDF) - Numonyx -> Micron

Part Name

Description

MFG CO.

M28W160C70ZB6F

16 Mbit (1Mb x16, Boot Block) 3V Supply Flash Memory

Numonyx -> Micron 

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Figure 22. Locking Operations Flowchart and Pseudo Code

M28W160CT, M28W160CB

Start

Write 60h

Write

01h, D0h or 2Fh

Write 90h

Read Block

Lock States

Locking

NO

change

confirmed?

YES

Write FFh

End

locking_operation_command (address, lock_operation) {

writeToFlash (any_address, 0x60) ; /*configuration setup*/

if (lock_operation==LOCK) /*to protect the block*/

writeToFlash (address, 0x01) ;

else if (lock_operation==UNLOCK) /*to unprotect the block*/

writeToFlash (address, 0xD0) ;

else if (lock_operation==LOCK-DOWN) /*to lock the block*/

writeToFlash (address, 0x2F) ;

writeToFlash (any_address, 0x90) ;

if (readFlash (address) ! = locking_state_expected)

error_handler () ;

/*Check the locking state (see Read Block Signature table )*/

writeToFlash (any_address, 0xFF) ; /*Reset to Read Array mode*/

}

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