M58PR256J datasheet(102/114 Pages) STMICROELECTRONICS

102 / 114 page

Flowcharts and pseudo codes

M58PR256J, M58PR512J

102/114

Figure 25.

Main Array and EFA locking operations flowchart and pseudo code

Any address within the bank can equally be used.

Write

01h, D0h or 2Fh

AI10518

Read Block

Lock States

YES

Locking

change

confirmed?

Start

Write 60h (Main Array)

or 64h (EFA) (1)

locking_operation_command (address, lock_operation) {

/* EFA_locking_operation_command (address, lock_operation) { */

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

/* writeToFlash (address, 0x64) */

/* 60h is the command for Locking Operations on the array while 64h

is the command for Locking Operations on the EFA */

/* see note (1) */

if (readFlash (address) ! = locking_state_expected)

error_handler () ;

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

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

/*see note (1) */

}

Write FFh (1)

Write 90h (1)

End

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 (address, 0x90) ;

/*see note (1) */

M58PR256J Datasheet(PDF) 102 Page - STMicroelectronics

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