JS28F256P30T85 datasheet(70/102 Pages) INTEL

70 / 102 page

1-Gbit P30 Family

April 2005

Intel StrataFlash® Embedded Memory (P30)

Datasheet

Order Number: 306666, Revision: 001

down state, a Lock-Down command must be issued prior to changing WP# to VIL. Locked-down

blocks revert to the locked state upon reset or power up the device (see Figure 32, “Block Locking

State Diagram” on page 70).

13.1.4

Block Lock Status

The Read Device Identifier command is used to determine a block’s lock status (see Section 14.2,

“Read Device Identifier” on page 76). Data bits DQ[1:0] display the addressed block’s lock status;

DQ0 is the addressed block’s lock bit, while DQ1 is the addressed block’s lock-down bit.

13.1.5

Block Locking During Suspend

Block lock and unlock changes can be performed during an erase suspend. To change block

locking during an erase operation, first issue the Erase Suspend command. Monitor the Status

another command.

Next, write the desired lock command sequence to a block, which changes the lock state of that

block. After completing block lock or unlock operations, resume the erase operation using the

Erase Resume command.

Note:

A Lock Block Setup command followed by any command other than Lock Block, Unlock Block,

or Lock-Down Block produces a command sequence error and set Status Register bits SR[4] and

Figure 32.

Block Locking State Diagram

[X00]

[X01]

Power-Up/Reset

Unlocked

Locked

[011]

[111]

[110]

Locked-

Down

4,5

Software

Locked

[011]

Hardware

Locked

Unlocked

WP# Hardware Control

Notes:

1. [a,b,c] represents [WP#, DQ1, DQ0]. X = Don’t Care.

2. DQ1 indicates Block Lock-Down status. DQ1 = ‘0’, Lock-Down has not been issued

to this block. DQ1 = ‘1’, Lock-Down has been issued to this block.

3. DQ0 indicates block lock status. DQ0 = ‘0’, block is unlocked. DQ0 = ‘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)

W P# hardware control

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