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M58WR016QT Datasheet(PDF) 52 Page - Numonyx B.V

Part # M58WR016QT
Description  16 Mbit and 32 Mbit (x16, Multiple Bank, Burst) 1.8V supply Flash memories
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Manufacturer  NUMONYX [Numonyx B.V]
Direct Link  http://www.numonyx.com
Logo NUMONYX - Numonyx B.V

M58WR016QT Datasheet(HTML) 52 Page - Numonyx B.V

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Block locking
M58WR016QT, M58WR016QB, M58WR032QT, M58WR032QB
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11.4
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 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. These blocks can then be re-locked (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.
11.5
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. Refer to
Appendix Appendix D: Command interface state tables, for detailed information on which
commands are valid during erase suspend.


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