參數(shù)資料
型號： S29GL032N90BFI32
廠商： SPANSION LLC
元件分類： PROM
英文描述： 2M X 16 FLASH 3V PROM, 90 ns, PBGA48
封裝： 8.15 X 6.15 MM, LEAD FREE, FBGA-48
文件頁數(shù)： 27/81頁
文件大?。?/td> 3095K
代理商： S29GL032N90BFI32
October 29, 2008 S29GL-N_01_12
S29GL-N MirrorBit Flash Family
33
Data
She e t
8.11.3
Persistent Protection Bit Lock (PPB Lock Bit)
A global volatile bit. When set to the “freeze state”, the PPB bits cannot be changed. When cleared to the
“unfreeze state”, the PPB bits are changeable. There is only one PPB Lock Bit per device. The PPB Lock Bit
is cleared to the “unfreeze state” at power-up or hardware reset. There is no command sequence to unlock or
“unfreeze” the PPB Lock Bit.
Configuring the PPB Lock Bit to the freeze state requires approximately 100ns. Reading the PPB Lock Status
bit requires the initial access time (tACC) of the device.
Table 8.11 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.
Table 8.11 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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