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參數資料
| 型號： | S29WS128N0LBFW010 |
| 廠商： | SPANSION LLC |
| 元件分類： | PROM |
| 英文描述： | 256/128/64 MEGABIT CMOS 1.8 VOLT ONLY SIMULTANEOUS READ/WRITE BURST MODE FLASH MEMORY |
| 中文描述： | 8M X 16 FLASH 1.8V PROM, 70 ns, PBGA84 |
| 封裝： | 11.60 X 8 MM, LEAD FREE, PLASTIC, FBGA-84 |
| 文件頁數： | 49/95頁 |
| 文件大?。?/td> | 1745K |
| 代理商： | S29WS128N0LBFW010 |
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October 29, 2004 S29WSxxxN_00_F0
53
Pre l i m i n a r y
8.5 Password Protection Method
The Password Protection Method allows an even higher level of security than the Persistent
Sector Protection Mode by requiring a 64 bit password for unlocking the device PPB Lock Bit.
In addition to this password requirement, after power up and reset, the PPB Lock Bit is set
“0” to maintain the password mode of operation. Successful execution of the Password Unlock
command by entering the entire password clears the PPB Lock Bit, allowing for sector PPBs
modifications.
Notes
1.
There is no special addressing order required for programming the password. Once the
Password is written and verified, the Password Mode Locking Bit must be set in order to
prevent access.
2.
The Password Program Command is only capable of programming “0”s. Programming a
“1” after a cell is programmed as a “0” results in a time-out with the cell as a “0”.
3.
The password is all “1”s when shipped from the factory.
4.
All 64-bit password combinations are valid as a password.
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 Pro-
gram, 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 s at a time to pre-
vent a hacker from running through all the 64-bit combinations in an attempt to
correctly match a password.
11. Approximately 1 s 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 Bank 0. Reads and writes for other banks excluding Bank 0 are
allowed.
16. If the user attempts to program or erase a protected sector, the device ignores the com-
mand 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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