AT45DB321E datasheet(24/73 Pages) ETC2

24 / 73 page

AT45DB321E

8784F–DFLASH–11/2013

Table 8-3.

Sector 0 (0a and 0b) Sector Lockdown Register Byte Value

Table 8-4.

Read Sector Lockdown Register Command

Figure 8-2. Read Sector Lockdown Register

8.1.2

Freeze Sector Lockdown

The Sector Lockdown command can be permanently disabled, and the current sector lockdown state can be

permanently frozen so that no additional sectors can be locked down aside from those already locked down. Any

attempts to issue the Sector Lockdown command after the Sector Lockdown State has been frozen will be ignored.

To issue the Freeze Sector Lockdown command, the CS pin must be asserted and the opcode sequence of 34h, 55h,

AAh, and 40h must be clocked into the device. Any additional data clocked into the device will be ignored. When the CS

pin is deasserted, the current sector lockdown state will be permanently frozen within a time of tLOCK. In addition, the SLE

bit in the Status Register will be permanently reset to a Logic 0 to indicate that the Sector Lockdown command is

permanently disabled.

Table 8-5.

Freeze Sector Lockdown

Figure 8-3. Freeze Sector Lockdown

Bit 7:6

Bit 5:4

Bit 3:2

Bit 1:0

Data

Value

Sector 0a

(Page 0-7)

Sector 0b

(Page 8-127)

N/A

Sectors 0a and 0b Unlocked

00h

Sector 0a Locked

C0h

Sector 0b Locked

30h

Sectors 0a and 0b Locked

F0h

Command

Byte 1

Byte 2

Byte 3

Byte 4

Read Sector Lockdown Register

35h

XXh

35h

Data

n + 1

Data

n + 63

Each transition represents eight bits

Command

Byte 1

Byte 2

Byte 3

Byte 4

Freeze Sector Lockdown

34h

55h

AAh

40h

34h

55h

AAh

40h

Each transition represents eight bits

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