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參數(shù)資料
| 型號： | S71PL032JA0BAW074 |
| 廠商： | SPANSION LLC |
| 元件分類： | 存儲(chǔ)器 |
| 英文描述： | SPECIALTY MEMORY CIRCUIT, PBGA56 |
| 封裝： | 7 X 9 MM, 1.20 MM HEIGHT, FBGA-56 |
| 文件頁數(shù)： | 157/188頁 |
| 文件大?。?/td> | 5078K |
| 代理商： | S71PL032JA0BAW074 |
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May 21, 2004 S29PL127_064_032J_00_A1
S29PL127J/S29PL064J/S29PL032J for MCP
69
Prelimin ary
Protection Mode Locking Bit is programmed, the Persistent Sector Protection
Locking Bit program circuitry is disabled, thereby forcing the device to remain in
the Password Protection mode. Exiting the Mode Locking Bit Program command
is accomplished by writing the Read/Reset command.
Persistent Sector Protection Mode Locking Bit Program Command
The Persistent Sector Protection Mode Locking Bit Program Command programs
the Persistent Sector Protection Mode Locking Bit, which prevents the Password
Mode Locking Bit from ever being programmed. If the Persistent Sector Protec-
tion Mode Locking Bit is verified as programmed without margin, the Persistent
Sector Protection Mode Locking Bit Program Command should be reissued to im-
prove program margin. By disabling the program circuitry of the Password Mode
Locking Bit, the device is forced to remain in the Persistent Sector Protection
mode of operation, once this bit is set. Exiting the Persistent Protection Mode
Locking Bit Program command is accomplished by writing the Read/Reset
command.
SecSi Sector Protection Bit Program Command
The SecSi Sector Protection Bit Program Command programs the SecSi Sector
Protection Bit, which prevents the SecSi sector memory from being cleared. If the
SecSi Sector Protection Bit is verified as programmed without margin, the SecSi
Sector Protection Bit Program Command should be reissued to improve program
margin. Exiting the VCC-level SecSi Sector Protection Bit Program Command is
accomplished by writing the Read/Reset command.
PPB Lock Bit Set Command
The PPB Lock Bit Set command is used to set the PPB Lock bit if it is cleared either
at reset or if the Password Unlock command was successfully executed. There is
no PPB Lock Bit Clear command. Once the PPB Lock Bit is set, it cannot be cleared
unless the device is taken through a power-on clear or the Password Unlock com-
mand is executed. Upon setting the PPB Lock Bit, the PPBs are latched into the
DYBs. If the Password Mode Locking Bit is set, the PPB Lock Bit status is reflected
as set, even after a power-on reset cycle. Exiting the PPB Lock Bit Set command
is accomplished by writing the Read/Reset command (only in the Persistent Pro-
tection Mode).
DYB Write Command
The DYB Write command is used to set or clear a DYB for a given sector. The high
order address bits (Amax–A12) are issued at the same time as the code 01h or
00h on DQ7-DQ0. All other DQ data bus pins are ignored during the data write
cycle. The DYBs are modifiable at any time, regardless of the state of the PPB or
PPB Lock Bit. The DYBs are cleared at power-up or hardware reset.Exiting the
DYB Write command is accomplished by writing the Read/Reset command.
Password Unlock Command
The Password Unlock command is used to clear the PPB Lock Bit so that the PPBs
can be unlocked for modification, thereby allowing the PPBs to become accessible
for modification. The exact password must be entered in order for the unlocking
function to occur. This command cannot be issued any faster than 2 s at a time
to prevent a hacker from running through all 64-bit combinations in an attempt
to correctly match a password. If the command is issued before the 2 s execu-
tion window for each portion of the unlock, the command will be ignored.
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