28F640W30 NUMONYX [Numonyx B.V], 28F640W30 Datasheet - Page 72

• Manufacturer Part Number: 28F640W30
• Description: Numonyx Wireless Flash Memory (W30)
• Manufacturer: NUMONYX [Numonyx B.V]

Figure 33: Block Locking State Diagram
13.1.1
13.1.2
13.1.3
Datasheet
72
Lock
All blocks default to locked (state [x01]) after initial power-up or reset. Locked blocks
are fully protected from alteration. Attempted program or erase operations to a locked
block return an error in SR[1].
Unlock
Unlocked blocks (states [x00] and [110]) can be programmed or erased. All unlocked
blocks return to the locked state when the flash device is reset or powered-down.
Lock-Down
Locked-down blocks (state [011]) offer an additional level of write protection beyond
the protection of a regular locked block. If a block is locked-down, the software cannot
change the state of the block if WP# is asserted.
• To lock unlocked blocks, use the Lock Block command sequence.
• To change the status of a locked block to unlocked or lock-down, use the
• To change the status of an unlocked block to the locked or locked-down state, use
• To unlock a locked block, write the Unlock Block command sequence if the block is
appropriate software commands.
the appropriate software commands.
not locked-down.
Power-Up/Reset
Notes: 1. [a,b,c] represents [WP#, D1, D0]. X = Don’t Care.
2. D1 indicates block Lock -down status.
3. D0 indicates block lock status.
4. Locked-down = Hardware + Software locked.
5. [011] states should be tracked by system software to determine difference between
- D0 = 0, block is unlocked.
- D0 = 1, block is locked.
Hardware Locked and Locked -Down states.
- D1 = 0, Lock -down has not been issued to this block .
- D1 = 1, Lock -down has been issued to this block .
Unlocked
Locked
[X01]
[X00]
WP# hardware control
Software Block Lock (0x60/0x01) or Software Block Unlock (0x60/0xD0)
Software Block Lock-Down (0x60/0x2F)
Software
Locked -
Locked
Down 4,5
[111]
[011]
Numonyx™ Wireless Flash Memory (W30)
Numonyx™ Wireless Flash Memory (W30)
WP# Hardware Control
Order Number: 290702-13
Hardware
Unlocked
Locked 5
[011]
[110 ]
November 2007
B5070