參數(shù)資料
型號(hào)： M30L0T8000B0ZAQE
廠商： STMICROELECTRONICS
元件分類： PROM
英文描述： 16M X 16 FLASH 1.8V PROM, 85 ns, PBGA88
封裝： 8 X 10 MM, 0.80 MM PITCH, LEAD FREE, BGA-88
文件頁數(shù)： 48/103頁
文件大?。?/td> 794K
代理商： M30L0T8000B0ZAQE
M30L0T8000T0, M30L0T8000B0
Block locking
49/103
9.4
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 cannot 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 Write Protect, WP, input pin.
When WP=0 (VIL), the blocks in the Lock-Down state (0,1,x) are protected from program,
erase and protection status changes.
When WP=1 (VIH) the Lock-Down function is disabled (1,1,x) and Locked-Down blocks can
be individually unlocked to the (1,1,0) state by issuing the software command, where they
can be erased and programmed.
When the Lock-Down function is disabled (WP=1) blocks can be locked (1,1,1) and
unlocked (1,1,0) as desired. When WP=0 blocks that were previously Locked-Down return
to the Lock-Down state (0,1,x) regardless of any changes that were made while WP=1.
Device reset or power-down resets all blocks, including those in Lock-Down, to the Locked
state.
9.5
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 operation, 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 completing any desired lock, read, or program operations, resume the
erase operation with the Erase Resume 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.
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