S25FL256S datasheet(61/149 Pages) CYPRESS

部品番号	S25FL256S

部品情報	128 Mbit (16 Mbyte)/256 Mbit (32 Mbyte) 3.0V SPI Flash Memory

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61 / 149 page

Document Number: 001-98283 Rev. *J

Page 61 of 149

S25FL128S/S25FL256S

8.4.3

Dynamic Protection Bits

Dynamic Protection Bits are volatile and unique for each sector and can be individually modified. DYB only control the protection for

sectors that have their PPB set to 1. By issuing the DYB Write command, a DYB is cleared to 0 or set to 1, thus placing each sector

in the protected or unprotected state respectively. This feature allows software to easily protect sectors against inadvertent changes,

yet does not prevent the easy removal of protection when changes are needed. The DYBs can be set or cleared as often as needed

as they are volatile bits.

8.4.4

PPB Lock Bit (PPBL[0])

The PPB Lock Bit is a volatile bit for protecting all PPB bits. When cleared to 0, it locks all PPBs and when set to 1, it allows the

PPBs to be changed.

The PLBWR command is used to clear the PPB Lock bit to 0. The PPB Lock Bit must be cleared to 0 only after all the PPBs are

configured to the desired settings.

In Persistent Protection mode, the PPB Lock is set to 1 during POR or a hardware reset. When cleared to 0, no software command

sequence can set the PPB Lock bit to 1, only another hardware reset or power-up can set the PPB Lock bit.

In the Password Protection mode, the PPB Lock bit is cleared to 0 during POR or a hardware reset. The PPB Lock bit can only be

set to 1 by the Password Unlock command.

8.4.5

Sector Protection States Summary

Each sector can be in one of the following protection states:



Unlocked — The sector is unprotected and protection can be changed by a simple command. The protection state defaults

to unprotected after a power cycle, software reset, or hardware reset.



Dynamically Locked — A sector is protected and protection can be changed by a simple command. The protection state is

not saved across a power cycle or reset.



Persistently Locked — A sector is protected and protection can only be changed if the PPB Lock Bit is set to 1. The

protection state is non-volatile and saved across a power cycle or reset. Changing the protection state requires

programming and or erase of the PPB bits

8.4.6

Persistent Protection Mode

The Persistent Protection method sets the PPB Lock bit to 1 during POR or Hardware Reset so that the PPB bits are unprotected by

a device hardware reset. Software reset does not affect the PPB Lock bit. The PLBWR command can clear the PPB Lock bit to 0 to

protect the PPB. There is no command to set the PPB Lock bit therefore the PPB Lock bit will remain at 0 until the next power-off or

hardware reset.

Table 8.3

Sector Protection States

Protection Bit Values

Sector State

PPB Lock

PPB

DYB

1

Unprotected – PPB and DYB are changeable

1

0

Protected – PPB and DYB are changeable

1

0

1

Protected – PPB and DYB are changeable

1

0

Protected – PPB and DYB are changeable

0

1

Unprotected – PPB not changeable, DYB is changeable

0

1

0

Protected – PPB not changeable, DYB is changeable

0

1

Protected – PPB not changeable, DYB is changeable

0

Protected – PPB not changeable, DYB is changeable

同様の部品番号 - S25FL256S

メーカー	部品番号	データシート	部品情報
SPANSION	S25FL256S	5Mb / 153P	MirrorBit짰 Flash Non-Volatile Memory CMOS 3.0 Volt Core with Versatile I/O Serial Peripheral Interface with Multi-I/O
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	S25FL256SAGBHIG13	5Mb / 153P	MirrorBit Flash Non-Volatile Memory CMOS 3.0 Volt Core with Versatile I/O Serial Peripheral Interface with Multi-I/O

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