M28W640ECB90N6 STMicroelectronics, M28W640ECB90N6 Datasheet - Page 50

• Manufacturer Part Number: M28W640ECB90N6
• Description: IC FLASH 64MBIT 90NS 48TSOP
• Manufacturer: STMicroelectronics

Specifications of M28W640ECB90N6

• Format - Memory: FLASH
• Memory Type: FLASH - Nor
• Memory Size: 64M (4M x 16)
• Speed: 90ns
• Interface: Parallel
• Voltage - Supply: 2.7 V ~ 3.6 V
• Operating Temperature: -40°C ~ 85°C
• Package / Case: 48-TSOP
• Lead Free Status / RoHS Status: Contains lead / RoHS non-compliant
• Other names: 497-1698

M28W640ECT, M28W640ECB
Figure 23. Locking Operations Flowchart and Pseudo Code
50/55
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