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S29GL01GP13FFIV20 Datasheet(PDF) 46 Page - SPANSION |
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S29GL01GP13FFIV20 Datasheet(HTML) 46 Page - SPANSION |
46 / 81 page 46 S29GL-P MirrorBit® Flash Family S29GL-P_00_A14 October 22, 2012 Da ta Sh e e t 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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