Document Number: 002-00886 Rev. *B
S29GL01GP
S29GL512P
S29GL256P
S29GL128P
7. The Password Mode Lock Bit is not erasable.
8. The lower two address bits (A1–A0) are valid during the Password Read, Password Program, and Password Unlock.
9. The exact password must be entered in order for the unlocking function to occur.
10. The Password Unlock command cannot be issued any faster than 1 µs at a time to prevent a hacker from running through
all the 64-bit combinations in an attempt to correctly match a password.
11. Approximately 1 µs is required for unlocking the device after the valid 64-bit password is given to the device.
12. Password verification is only allowed during the password programming operation.
13. All further commands to the password region are disabled and all operations are ignored.
14. If the password is lost after setting the Password Mode Lock Bit, there is no way to clear the PPB Lock Bit.
15. Entry command sequence must be issued prior to any of any operation and it disables reads and writes for Sector 0.
Reads and writes for other sectors excluding Sector 0 are allowed.
16. If the user attempts to program or erase a protected sector, the device ignores the command and returns to read mode.
17. A program or erase command to a protected sector enables status polling and returns to read mode without having
modified the contents of the protected sector.
18. The programming of the DYB, PPB, and PPB Lock for a given sector can be verified by writing individual status read
commands DYB Status, PPB Status, and PPB Lock Status to the device.