參數(shù)資料
型號: S71PL191HB0BFI100
廠商: SPANSION LLC
元件分類: 存儲器
英文描述: SPECIALTY MEMORY CIRCUIT, PBGA73
封裝: 9 X 13 MM, LEAD FREE, FBGA-73
文件頁數(shù): 22/172頁
文件大?。?/td> 4662K
代理商: S71PL191HB0BFI100
22
S29JL064H
S29JL064HA1 May 7, 2004
Pr el i m i n ary
The SecSi Sector area can be protected using one of the following procedures:
Write the three-cycle Enter SecSi Sector Region command sequence, and
then follow the in-system sector protect algorithm as shown in Figure 2, ex-
cept that RESET# may be at either VIH or VID. This allows in-system protec-
tion of the SecSi Sector Region without raising any device pin to a high
voltage. Note that this method is only applicable to the SecSi Sector.
To verify the protect/unprotect status of the SecSi Sector, follow the algo-
rithm shown in Figure 3.
Once the SecSi Sector is locked and verified, the system must write the Exit SecSi
Sector Region command sequence to return to reading and writing the remainder
of the array.
The SecSi Sector lock must be used with caution since, once locked, there is no
procedure available for unlocking the SecSi Sector area and none of the bits in
the SecSi Sector memory space can be modified in any way.
Figure 3. SecSi Sector Protect Verify
Hardware Data Protection
The command sequence requirement of unlock cycles for programming or erasing
provides data protection against inadvertent writes (refer to Table 4 for command
definitions). In addition, the following hardware data protection measures pre-
vent accidental erasure or programming, which might otherwise be caused by
spurious system level signals during VCC power-up and power-down transitions,
or from system noise.
Low VCC Write Inhibit
When VCC is less than VLKO, the device does not accept any write cycles. This pro-
tects data during VCC power-up and power-down. The command register and all
internal program/erase circuits are disabled, and the device resets to the read
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