NAND04GR3B datasheet(34/59 Pages) STMICROELECTRONICS

34 / 59 page

NAND512-B, NAND01G-B, NAND02G-B, NAND04G-B, NAND08G-B

34/59

Blocks Lock-Down

The Lock-Down feature provides an additional lev-

el of protection. A Locked-down block cannot be

unlocked by a software command. Locked-Down

blocks can only be unlocked by setting the Write

Protect signal to Low for a minimum of 100ns.

Only locked blocks can be locked-down. The com-

mand has no affect on unlocked blocks.

Refer to Figure 25., Command Latch AC Wave-

forms for details on how to issue the command.

Block Lock Status

In Block Lock mode (PRL High) the Block Lock

Status of each block can be checked by issuing a

Read Block Lock Status command (see Table

10.).

The command consists of:

■

one bus cycle to give the command code

■

three bus cysles to give the block address

After this, a read cycle will then output the Block

Lock Status on the I/O pins on the falling edge of

Chip Enable or Read Enable, whichever occurs

last. Chip Enable or Read Enable do not need to

be toggled to update the status.

The Read Block Lock Status command will not be

accepted while the device is busy (RB Low).

The device will remain in Read Block Lock Status

mode until another command is issued.

If the device is not in the Block Lock mode (PRL

Low) the Block Status can be read in the Status

mand.

Figure 20. Read Block Lock Status Operation

Note: Three address cycles are required for 2,4 and 8 Gb devices. The 512Mb and 1Gb devices only require two address cycles.

Table 16. Block Lock Status

Note: X = Don’t Care.

Status

I/O7-I/O3

I/O2

I/O1

I/O0

Locked

Unlocked

Locked-Down

Unlocked in Locked-

Down Area

I/O

Block Address, 3 cycles

ai08669

7Ah

Read Block Lock

Status Command

Add1

Add2

Add3

Dout

Block Lock Status

tWHRL

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