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S71WS512NC0BAWE33 ๋ฐ์ดํ„ฐ์‹œํŠธ(HTML) 62 Page - SPANSION

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์ƒ์„ธ๋‚ด์šฉ  Stacked Multi-Chip Product (MCP)
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S71WS-Nx0 Based MCPs
S71WS-N_01_A4 September 15, 2005
Ad van c e
Inf o rmation
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 pre-
vent access.
2.
The Password Program Command is only capable of programming โ€œ0โ€s. Programming a โ€œ1โ€
after a cell is programmed as a โ€œ0โ€ results in a time-out with the cell as a โ€œ0โ€.
3.
The password is all โ€œ1โ€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 (A1โ€“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 ยตs 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 ยตs 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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