S29GL01GS datasheet(22/104 Pages) SPANSION

22 / 104 page

GL-S MirrorBit® Family

S29GL_128S_01GS_00_06 March 16, 2012

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Sh e e t

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

PPB 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

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

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 Spansion. 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 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 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. If the password unlock

command provided password does not match the hidden internal password, the unlock operation fails in

the same manner as a programming operation on a protected sector. The status register will return to the

ready state with the Program Status Bit set to 1 indicating a failed programming operation due to a locked

sector. In this case it is a failure to change the state of the PPB Lock bit because it is still protected by the

lack of a valid password. The data polling status will remain active, with DQ7 set to the complement of the

DQ7 bit in the last word of the password unlock command, and DQ6 toggling.

 The device requires approximately 100 µs for setting the PPB Lock after the valid 64-bit password is given

to the device.

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