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Table 9-2.

Valid SPRL and Global Protect/Unprotect Conditions

New

Write Status

Current

Register Data

New

WP

SPRL

Bit

SPRL

State

Value

76543210

0x0000xx

0x0001xx

Protection Operation

Global Unprotect – all Sector Protection Registers reset to 0

No change to current protection.

Value

0

0

No change to current protection.

0

0

0

0x1110xx

0x1111xx

1x0000xx

1x0001xx

1x1110xx

1x1111xx

No change to current protection.

Global Protect – all Sector Protection Registers set to 1

Global Unprotect – all Sector Protection Registers reset to 0

No change to current protection.

No change to current protection.

No change to current protection.

Global Protect – all Sector Protection Registers set to 1

0

0

1

1

1

1

1

No change to the current protection level. All sectors currently

protected will remain protected and all sectors currently unprotected

will remain unprotected.

0

1

xxxxxxxx

The Sector Protection Registers are hard-locked and cannot be

changed when the WP pin is LOW and the current state of SPRL is 1.

Therefore, a Global Protect/Unprotect will not occur. In addition, the

SPRL bit cannot be changed (the WP pin must be HIGH in order to

change SPRL back to a 0).

1

0

0x0000xx

0x0001xx

0x1110xx

0x1111xx

1x0000xx

1x0001xx

1x1110xx

1x1111xx

0x0000xx

0x0001xx

Global Unprotect – all Sector Protection Registers reset to 0

No change to current protection.

No change to current protection.

No change to current protection.

Global Protect – all Sector Protection Registers set to 1

Global Unprotect – all Sector Protection Registers reset to 0

No change to current protection.

No change to current protection.

No change to current protection.

Global Protect – all Sector Protection Registers set to 1

No change to the current protection level. All sectors

currently protected will remain protected, and all sectors

0

0

0

0

0

1

1

1

1

1

0

0

0x1110xx

currently unprotected will remain unprotected.

0

0

0x1111xx

The Sector Protection Registers are soft-locked and cannot

0

1

1

be changed when the current state of SPRL is 1. Therefore,

1x0000xx

1x0001xx

1x1110xx

1x1111xx

a Global Protect/Unprotect will not occur. However, the

SPRL bit can be changed back to a 0 from a 1 since the WP

pin is HIGH. To perform a Global Protect/Unprotect, the

Write Status Register command must be issued again after

the SPRL bit has been changed from a 1 to a 0.

1

1

1

1

1

Essentially, if the SPRL bit of the Status Register is in the logical “0” state (Sector Protection

Registers are not locked), then writing a 00h to the Status Register will perform a Global Unpro-

tect without changing the state of the SPRL bit. Similarly, writing a 7Fh to the Status Register will

perform a Global Protect and keep the SPRL bit in the logical “0” state. The SPRL bit can, of

course, be changed to a logical “1” by writing an FFh if software-locking or hardware-locking is

desired along with the Global Protect.

16

AT25DF321

3669B–DFLASH–6/09

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