S29GL01GP11TFIR20 Datasheet, PDF (46/81 Pages) SPANSION – 1 Gigabit, 512 Megabit, 256 Megabit and 128 Megabit 3.0 Volt-only Page Mode Flash Memory featuring 90 nm MirrorBit Process Technology

Data Sheet
5. There is no means to verify what the password is after it is set.
6. The Password Mode Lock Bit, once set, prevents reading the 64-bit password on the data bus and
further password programming.
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.
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S29GL-P MirrorBit^® Flash Family
S29GL-P_00_A14 October 22, 2012