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| 型號： | S29GL128N11FFIVH2 |
| 廠商： | SPANSION LLC |
| 元件分類： | PROM |
| 英文描述： | 16M X 16 FLASH 3V PROM, 110 ns, PBGA64 |
| 封裝： | 10 X 13 MM, 1 MM PITCH, LEAD FREE, FBGA-64 |
| 文件頁數(shù)： | 22/74頁 |
| 文件大小： | 1593K |
| 代理商： | S29GL128N11FFIVH2 |
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May 1, 2006 S29GL-N_01_A0
S29GL-N
27
Data
She e t
Table 8.6 contains all possible combinations of the DYB bit, PPB bit, and PPB Lock Bit relating to the status
of the sector. In summary, if the PPB bit is set, and the PPB Lock Bit is set, the sector is protected and the
protection cannot be removed until the next power cycle or hardware reset clears the PPB Lock Bit to
“unfreeze state”. If the PPB bit is cleared, the sector can be dynamically locked or unlocked. The DYB bit 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 sector enables status polling for approximately 1 s 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 s after which the device returns to read mode without having erased the
protected sector. The programming of the DYB bit, PPB bit, and PPB Lock Bit for a given sector can be
verified by writing a DYB Status Read, PPB Status Read, and PPB Lock Status Read commands to the
device.
The Autoselect Sector Protection Verification outputs the OR function of the DYB bit and PPB bit per sector
basis. When the OR function of the DYB bit and PPB bit is a 1, the sector is either protected by DYB or PPB
or both. When the OR function of the DYB bit and PPB bit is a 0, the sector is unprotected through both the
DYB and PPB.
8.14
Persistent Protection Mode Lock Bit
Like the Password Protection Mode Lock Bit, a Persistent Protection Mode Lock Bit exists to guarantee that
the device remain in software sector protection. Once programmed, the Persistent Protection Mode Lock Bit
prevents programming of the Password Protection Mode Lock Bit. This guarantees that a hacker could not
place the device in Password Protection Mode. The Password Protection Mode Lock Bit resides in the “Lock
Register”.
8.15
Password Sector Protection
The Password Sector Protection method allows an even higher level of security than the Persistent Sector
Protection method. There are two main differences between the Persistent Sector Protection and the
Password Sector Protection methods:
When the device is first powered on, or comes out of a reset cycle, the PPB Lock Bit is set to the locked
state, or the freeze state, rather than cleared to the unlocked state, or the unfreeze state.
The only means to clear and unfreeze 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.
The password is stored in a one-time programmable (OTP) region outside of the flash memory. Once the
Password Protection 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 and unfreeze 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 to the unfreezed state, and the
PPB bits can be altered. If they do not match, the flash device does nothing. There is a built-in 2 s delay for
Table 8.6 Sector Protection Schemes
Protection States
Sector State
DYB Bit
PPB Bit
PPB Lock Bit
Unprotect
Unfreeze
Unprotected – PPB and DYB are changeable
Unprotect
Freeze
Unprotected – PPB not changeable, DYB is changeable
Unprotect
Protect
Unfreeze
Protected – PPB and DYB are changeable
Unprotect
Protect
Freeze
Protected – PPB not changeable, DYB is changeable
Protect
Unprotect
Unfreeze
Protected – PPB and DYB are changeable
Protect
Unprotect
Freeze
Protected – PPB not changeable, DYB is changeable
Protect
Unfreeze
Protected – PPB and DYB are changeable
Protect
Freeze
Protected – PPB not changeable, DYB is changeable
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