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| 型號： | S29NS064N0SBJW002 |
| 廠商： | SPANSION LLC |
| 元件分類： | DRAM |
| 英文描述： | Simultaneous Read/Write, Multiplexed, Burst Mode Flash Memory |
| 中文描述： | 4M X 16 FLASH 1.8V PROM, 80 ns, PBGA44 |
| 封裝： | 7.70 X 6.20 MM, LEAD FREE, FBGA-44 |
| 文件頁數(shù)： | 25/86頁 |
| 文件大小： | 1036K |
| 代理商： | S29NS064N0SBJW002 |
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S29NS-N_00_A12 June 13, 2006
S29NS-N MirrorBit Flash Family
23
D a t a
S h e e t
( A d v a n c e
I n f o r m a t i o n )
The password is stored in a
one-time programmable (OTP)
region of the flash memory. Once the Password
Mode Lock 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 1 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.
8.17
64-bit Password
The 64-bit Password is located in a non-erasable region of the FLash and is accessible through the use of the
Password Program and Verify commands (see
Password Protection Command Set Definitions
on page 48
).
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.
8.18
Password Mode Lock Bit
In order to select the Password Sector Protection scheme, the customer must first program the password.
Spansion LLC recommends that the password be somehow correlated to the unique Electronic Serial
Number (ESN) of the particular flash device. Each ESN is different for every flash device; therefore each
password should be different for every flash 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:
It permanently sets the device to operate using the Password Sector Protection Mode. It is not possible to
reverse this function.
It also 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 Sector 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 Lock Bit, there will be no way
to clear the PPB Lock Bit.
The Password Mode Lock Bit, once set, prevents reading the 64-bit password on the DQ bus and further
password programming.
The Password Mode Lock Bit is not erasable.
Once Password Mode Lock Bit is
programmed, the Persistent Mode Lock Bit is disabled from programming, guaranteeing that no changes to
the protection scheme are allowed.
8.19
Persistent Protection Bit Lock (PPB Lock Bit) in Password Sector
Protection Mode
The Persistent Protection Bit Lock (PPB Lock Bit) is a volatile bit that reflects the state of the Password Mode
Lock Bit after power-up reset. If the Password Mode Lock Bit is also set, after a hardware reset (RESET#
asserted) or a power-up reset, the ONLY means for clearing the PPB Lock Bit in Password Protection Mode
is to issue the Password Unlock command. Successful execution of the Password Unlock command to enter
the entire password clears the PPB Lock Bit, allowing for sector PPBs modifications. Asserting RESET#,
taking the device through a power-on reset, or issuing the PPB Lock Bit Set command sets the PPB Lock Bit
to a “1”.
If the Password Mode Lock Bit is not set (device is operating in the default Persistent Protection Mode). The
Password Unlock command is ignored in Persistent Sector Protection Mode.
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| S29NS128J0LBAW003 | 制造商:SPANSION 制造商全稱:SPANSION 功能描述:Burst Mode Flash Memories |
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