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S71PL129JC0 ๋ฐ์ดํ„ฐ์‹œํŠธ(HTML) 35 Page - SPANSION

๋ถ€ํ’ˆ๋ช… S71PL129JC0
์ƒ์„ธ๋‚ด์šฉ  Stacked Multi-Chip Product (MCP) Flash Memory
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S71PL129JC0 ๋ฐ์ดํ„ฐ์‹œํŠธ(HTML) 35 Page - SPANSION

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June 4, 2004 S29PL129J_MCP_00_A0
S29PL129J for MCP
35
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Informatio n
In summary, if the PPB is set, and the PPB lock is set, the sector is protected and
the protection can not be removed until the next power cycle clears the PPB lock.
If the PPB is cleared, the sector can be dynamically locked or unlocked. The DYB
then controls whether or not the sector is protected or unprotected.
If the user attempts to program or erase a protected sector, the device ignores
the command and returns to read mode. A program command to a protected sec-
tor enables status polling for approximately 1 ยตs before the device returns to read
mode without having modified the contents of the protected sector. An erase
command to a protected sector enables status polling for approximately 50 ยตs
after which the device returns to read mode without having erased the protected
sector.
The programming of the DYB, PPB, and PPB lock for a given sector can be verified
by writing a DYB/PPB/PPB lock verify command to the device. There is an alter-
native means of reading the protection status. Take RESET# to VIL and hold WE#
at VIH.(The high voltage A9 Autoselect Mode also works for reading the status of
the PPBs). Scanning the addresses (A18โ€“A11) while (A6, A1, A0) = (0, 1, 0) pro-
duces a logical โ€˜1โ€ code at device output DQ0 for a protected sector or a โ€œ0โ€ for
an unprotected sector. In this mode, the other addresses are donโ€™t cares. Address
location with A1 = VIL are reserved for autoselect manufacturer and device
codes.
Persistent Sector Protection Mode Locking Bit
Like the password mode locking bit, a Persistent Sector Protection mode locking
bit exists to guarantee that the device remain in software sector protection. Once
set, the Persistent Sector Protection locking bit prevents programming of the
password protection mode locking bit. This guarantees that a hacker could not
place the device in password protection mode.
Password Protection Mode
The Password Sector Protection Mode method allows an even higher level of se-
curity than the Persistent Sector Protection Mode. There are two main differences
between the Persistent Sector Protection and the Password Sector Protection
Mode:
When the device is first powered on, or comes out of a reset cycle, the PPB Lock
bit set to the locked state, rather than cleared to the unlocked state.
The only means to clear the PPB Lock bit is by writing a unique 64-bit Password
to the device.
The Password Sector Protection method is otherwise identical to the Persistent
Sector Protection method.
A 64-bit password is the only additional tool utilized in this method.
Once the Password Mode Locking Bit is set, the password is permanently set with
no means to read, program, or erase it. The password is used to clear the PPB
Lock bit. The Password Unlock command must be written to the flash, along with
a password. The flash device internally compares the given password with the
pre-programmed password. If they match, the PPB Lock bit is cleared, and the
PPBs can be altered. If they do not match, the flash device does nothing. There
is a built-in 2 ยตs delay for each โ€œpassword check.โ€ This delay is intended to thwart
any efforts to run a program that tries all possible combinations in order to crack
the password.


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