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參數(shù)資料
| 型號： | W78M64V100SBC |
| 廠商： | WHITE ELECTRONIC DESIGNS CORP |
| 元件分類： | PROM |
| 英文描述： | 8M X 64 FLASH 3.3V PROM MODULE, 100 ns, PBGA159 |
| 封裝： | 13 X 22 MM, 1.27 MM PITCH, PLASTIC, BGA-159 |
| 文件頁數(shù)： | 10/54頁 |
| 文件大小： | 1348K |
| 代理商： | W78M64V100SBC |
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18
White Electronic Designs Corporation (602) 437-1520 www.whiteedc.com
White Electronic Designs
W78M64V-XSBX
July 2006
Rev. 4
White Electronic Designs Corp. reserves the right to change products or specications without notice.
PASSWORD PROTECTION MODE
The Password Sector Protection Mode method allows an
even higher level of security 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 rst 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 ash,
along with a password. The ash 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 ash device does
nothing. There is a built-in 2 μs delay for each “password
check.” This delay is intended to thwart any efforts to run
a program that tries all possible combinations in order to
crack the password.
Password and Password Mode Locking Bit
In order to select the Password sector protection scheme,
the customer must first program the password. The
password may be correlated to the unique Electronic
Serial Number (ESN) of the particular ash device. Each
ESN is different for every ash device; therefore each
password should be different for every ash device. While
programming in the password region, the customer may
perform Password Verify operations.
Once the desired password is programmed in, the customer
must then set the Password Mode Locking Bit. This
operation achieves two objectives:
1. Permanently sets the device to operate using the
Password Protection Mode. It is not possible to reverse
this function.
2. Disables all further commands to the password region.
All program, and read operations are ignored.
Both of these objectives are important, and if not carefully
considered, may lead to unrecoverable errors. The user
must be sure that the Password Protection method is
desired when setting the Password Mode Locking Bit. More
importantly, the user must be sure that the password is
correct when the Password Mode Locking Bit is set. Due to
the fact that read operations are disabled, there is no means
to verify what the password is afterwards. If the password
is lost after setting the Password Mode Locking Bit, there
will be no way to clear the PPB Lock bit.
The Password Mode Locking Bit, once set, prevents reading
the 64-bit password on the DQ bus and further password
programming. The Password Mode Locking Bit is not
erasable. Once Password Mode Locking Bit is programmed,
the Persistent Sector Protection Locking Bit is disabled
from programming, guaranteeing that no changes to the
protection scheme are allowed.
64-bit Password
The 64-bit Password is located in its own memory space and
is accessible through the use of the Password Program and
Verify commands (see “Password Verify Command”). The
password function works in conjunction with the Password
Mode Locking Bit, which when set, prevents the Password
Verify command from reading the contents of the password
on the pins of the device.
WRITE PROTECT (WP#)
The Write Protect feature provides a hardware method of
protecting sectors 0, 1, 268, and 269 without using VID.
This function is provided by the WP# pin and overrides
the previously discussed High Voltage Sector Protection
method.
If the system asserts VIL on the WP#/ACC pin, the device
disables program and erase functions in the two outermost
4 Kword sectors on both ends of the ash array independent
of whether it was previously protected or unprotected.
If the system asserts VIH on the WP#/ACC pin, the device
reverts to whether sectors 0, 1, 268, and 269 were last set
to be protected or unprotected. That is, sector protection
or unprotection for these sectors depends on whether
they were last protected or unprotected using the method
described in High Voltage Sector Protection.
Note that the WP#/ACC pin must not be left oating or
unconnected; inconsistent behavior of the device may
result.
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