PC48F4400PLVB0 datasheet(72/102 Pages) NUMONYX

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Numonyx™ Wireless Flash Memory (W18)

Datasheet

November 2007

Order Number: 290701-18

Numonyx™ Wireless Flash Memory (W18)

13.1.1

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 will return an error in SR[1]. Unlocked blocks can be locked by using the Lock

Block command sequence. Similarly, a locked block’s status can be changed to

unlocked or lock-down using the appropriate software commands.

13.1.2

Unlock

Unlocked blocks (states [x00] and [110]) can be programmed or erased. All unlocked

blocks return to the locked state when the device is reset or powered-down. An

unlocked block’s status can be changed to the locked or locked-down state using the

appropriate software commands. A locked block can be unlocked by writing the Unlock

Block command sequence if the block is not locked-down.

13.1.3

Lock-Down

Locked-down blocks (state [011]) offer the user an additional level of write protection

beyond that of a regular locked block. A block that is locked-down cannot have it’s

state changed by software if WP# is asserted. A locked or unlocked block can be

locked-down by writing the Lock-Down Block command sequence. If a block was set to

locked-down, then later changed to unlocked, a Lock-Down command should be issued

prior asserting WP# will put that block back to the locked-down state. When WP# is

deasserted, locked-down blocks are changed to the locked state and can then be

unlocked by the Unlock Block command.

Figure 31: Block Locking State Diagram

[X00]

[X01]

Power-Up/Reset

Unlocked

Locked

[011]

[111]

[110]

Locked-

Down4,5

Software

Locked

[011]

Hardware

Locked5

Unlocked

WP# Hardware Control

Notes:

1. [a,b,c] represents [WP#, D1, D0]. X = Don’t Care.

2. D1 indicates block Lock-down status. D1 = ‘0’, Lock-down has not been issued to

this block. D1 = ‘1’, Lock-down has been issued to this block.

3. D0 indicates block lock status. D0 = ‘0’, block is unlocked. D0 = ‘1’, block is locked.

4. Locked-down = Hardware + Software locked.

5. [011] states should be tracked by system software to determine difference between

Hardware Locked and Locked-Down states.

Software Block Lock (0x60/0x01) or Software Block Unlock (0x60/0xD0)

Software Block Lock-Down (0x60/0x2F)

WP# hardware control

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