RC28F256 Intel Corporation, RC28F256 Datasheet - Page 70

• Manufacturer Part Number: RC28F256
• Description: Intel StrataFlash Embedded Memory
• Manufacturer: Intel Corporation

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1-Gbit P30 Family
13.1.4
Figure 32.
13.1.5
Note:
April 2005
70
down state, a Lock-Down command must be issued prior to changing WP# to V
blocks revert to the locked state upon reset or power up the device (see
State Diagram” on page
Block Lock Status
The Read Device Identifier command is used to determine a block’s lock status (see
“Read Device Identifier” on page
DQ0 is the addressed block’s lock bit, while DQ1 is the addressed block’s lock-down bit.
Block Locking State Diagram
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
Register until SR[7] and SR[6] are set, indicating the device is suspended and ready to accept
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.
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
Power-Up/Reset
Notes:
Intel StrataFlash
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
3. DQ0 indicates block lock status. DQ0 = ‘0’, block is unlocked. DQ0 = ‘1’, block is
4. Locked-down = Hardware + Software locked.
5. [011] states should be tracked by system software to determine difference between
to this block. DQ1 = ‘1’, Lock-Down has been issued to this block.
locked.
Hardware Locked and Locked-Down states.
Order Number: 306666, Revision: 001
70).
Unlocked
Locked
[X01]
[X00]
76). Data bits DQ[1:0] display the addressed block’s lock status;
®
Embedded Memory (P30)
Software Block Lock (0x60/0x01) or Software Block Unlock (0x60/0xD0)
Software Block Lock -Down (0x60/0x2F)
W P# hardware control
Software
Locked-
Down
Locked
[111]
[011]
4,5
WP# Hardware Control
Figure 32, “Block Locking
IL
Hardware
Unlocked
Locked
. Locked-down
[011]
[110]
Section 14.2,
Datasheet
5