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M28W640ECT Datasheet(PDF) 17 Page - STMicroelectronics |
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M28W640ECT Datasheet(HTML) 17 Page - STMicroelectronics |
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17 / 55 page  17/55 M28W640ECT, M28W640ECB Lock-Down State Blocks that are Locked-Down (state (0,1,x))are protected from program and erase operations (as for Locked blocks) but their protection status can- not be changed using software commands alone. A Locked or Unlocked block can be Locked-Down by issuing the Lock-Down command. Locked- Down blocks revert to the Locked state when the device is reset or powered-down. The Lock-Down function is dependent on the WP input pin. When WP=0 (VIL), the blocks in the Lock-Down state (0,1,x) are protected from pro- gram, erase and protection status changes. When WP=1 (VIH) the Lock-Down function is disabled (1,1,1) and Locked-Down blocks can be individu- ally unlocked to the (1,1,0) state by issuing the software command, where they can be erased and programmed. These blocks can then be relocked (1,1,1) and unlocked (1,1,0) as desired while WP remains high. When WP is low , blocks that were previously Locked-Down return to the Lock-Down state (0,1,x) regardless of any changes made while WP was high. Device reset or power-down resets all blocks , including those in Lock-Down, to the Locked state. Locking Operations During Erase Suspend Changes to block lock status can be performed during an erase suspend by using the standard locking command sequences to unlock, lock or lock-down a block. This is useful in the case when another block needs to be updated while an erase operation is in progress. To change block locking during an erase opera- tion, first write the Erase Suspend command, then check the status register until it indicates that the erase operation has been suspended. Next write the desired Lock command sequence to a block and the lock status will be changed. After complet- ing any desired lock, read, or program operations, resume the erase operation with the Erase Re- sume command. If a block is locked or locked-down during an erase suspend of the same block, the locking status bits will be changed immediately, but when the erase is resumed, the erase operation will complete. Locking operations cannot be performed during a program suspend. Refer to Appendix D, Com- mand Interface and Program/Erase Controller State, for detailed information on which com- mands are valid during erase suspend. Table 9. Block Lock Status Item Address Data Block Lock Configuration xx002 LOCK Block is Unlocked DQ0=0 Block is Locked DQ0=1 Block is Locked-Down DQ1=1 |
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