S29GL01GS datasheet(18/118 Pages) INFINEON

18 / 118 page

Datasheet

001-98285 Rev. *T

2023-07-17

128 Mb/256 Mb/512 Mb/1 Gb GL-S MIRRORBIT™ Flash

Parallel, 3.0 V

Data protection

As shipped from the factory, all devices default to the persistent protection method, with all sectors unprotected,

when power is applied. The device programmer or host system can then choose which sector protection method

to use. Programming either of the following two, one-time programmable, non-volatile bits, locks the part

permanently in that mode:

• Persistent protection mode lock bit (DQ1)

• Password protection mode lock bit (DQ2)

If both lock bits are selected to be programmed at the same time, the operation will abort. Once the password

mode lock bit is programmed, the persistent mode lock bit is permanently disabled and no changes to the

protection scheme are allowed. Similarly, if the persistent mode lock bit is programmed, the password mode is

permanently disabled.

If the password mode is to be chosen, the password must be programmed prior to setting the corresponding lock

lock bit set command is required to set the PPB lock bit to ‘0’ to protect the PPB array.

The programming time of the lock register is the same as the typical word programming time. During a lock

The system can also determine the status of the lock register programming by reading the status register. See

“Status register” on page 36 for information on these status bits.

The user is not required to program DQ2 or DQ1, and DQ6 or DQ0 bits at the same time. This allows the user to

lock the SSR before or after choosing the device protection scheme. When programming the lock bits, the

reserved bits must be ‘1’ (masked).

3.4.8

Persistent protection mode

The persistent protection method sets the PPB lock to ‘1’ during POR or hardware reset so that the PPB bits are

unprotected by a device reset. There is a command to clear the PPB lock bit to ‘0’ to protect the PPB. There is no

command in the persistent protection method to set the PPB lock bit to ‘1’ therefore the PPB Lock bit will remain

at ‘0’ until the next power-off or hardware reset.

3.4.9

Password protection mode

3.4.9.1

PPB password protection mode

PPB password protection mode allows an even higher level of security than the persistent sector protection

mode, by requiring a 64-bit password for setting the PPB lock. In addition to this password requirement, after

power up and reset, the PPB lock is cleared to ‘0’ to ensure protection at power-up. Successful execution of the

password unlock command by entering the entire password sets the PPB lock to ‘1’, allowing for sector PPB

modifications.

Password protection notes:

• The password program command is only capable of programming 0’s.

• The password is all 1’s when shipped from Infineon. It is located in its own memory space and is accessible

through the use of the password program and password read commands.

• All 64-bit password combinations are valid as a password.

• Once the password is programmed and verified, the password mode locking bit must be set in order to prevent

reading or modification of the password.

• The password mode lock bit, once programmed, prevents reading the 64-bit password on the data bus and

further password programming. All further program and read commands to the password region are disabled

(data is read as 1’s) and these commands are ignored. There is no means to verify what the password is after

the password protection mode lock bit is programmed. Password verification is only allowed before selecting

the password protection mode.

• The password mode lock bit is not erasable.

• The exact password must be entered in order for the unlocking function to occur.

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