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NZ48F4000L0ZBQ0 参数 Datasheet PDF下载

NZ48F4000L0ZBQ0图片预览
型号: NZ48F4000L0ZBQ0
PDF下载: 下载PDF文件 查看货源
内容描述: 1.8 ?伏?英特尔? StrataFlash㈢ ?无线存储器?与? 3.0伏? I / O ? ( L30 ) [1.8 Volt Intel StrataFlash㈢ Wireless Memory with 3.0-Volt I/O (L30)]
分类和应用: 存储无线
文件页数/大小: 100 页 / 1405 K
品牌: INTEL [ INTEL ]
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28F640L30, 28F128L30, 28F256L30  
7.0  
Security Modes  
The device features security modes used to protect the information stored in the flash memory  
array. The following sections describe each security mode in detail.  
7.1  
Block Locking  
Individual instant block locking is used to protect user code and/or data within the flash memory  
array. All blocks power up in a locked state to protect array data from being altered during power  
transitions. Any block can be locked or unlocked with no latency. Locked blocks cannot be  
programmed or erased; they can only be read.  
Software-controlled security is implemented using the Block Lock and Block Unlock commands.  
Hardware-controlled security can be implemented using the Block Lock-Down command along  
with asserting WP#. Also, VPP data security can be used to inhibit program and erase operations  
(see Section 5.6, “Program Protection” on page 35 and Section 6.4, “Erase Protection” on page 37).  
7.1.1  
Lock Block  
To lock a block, issue the Lock Block Setup command. The next command must be the Lock Block  
command issued to the desired block’s address (see Section 3.2, “Device Commands” on page 18  
and Figure 36, “Block Lock Operations Flowchart” on page 80). If the Set Read Configuration  
Register command is issued after the Block Lock Setup command, the device configures the RCR  
instead.  
Block lock and unlock operations are not affected by the voltage level on VPP. The block lock bits  
may be modified and/or read even if VPP is below VPPLK  
.
7.1.2  
7.1.3  
Unlock Block  
The Unlock Block command is used to unlock blocks (see Section 3.2, “Device Commands” on  
page 18). Unlocked blocks can be read, programmed, and erased. Unlocked blocks return to a  
locked state when the device is reset or powered down. If a block is in a lock-down state, WP#  
must be deasserted before it can be unlocked (see Figure 8, “Block Locking State Diagram” on  
page 39).  
Lock-Down Block  
A locked or unlocked block can be locked-down by writing the Lock-Down Block command  
sequence (see Section 3.2, “Device Commands” on page 18). Blocks in a lock-down state cannot  
be programmed or erased; they can only be read. However, unlike locked blocks, their locked state  
cannot be changed by software commands alone. A locked-down block can only be unlocked by  
issuing the Unlock Block command with WP# deasserted. To return an unlocked block to locked-  
down state, a Lock-Down command must be issued prior to changing WP# to VIL. Locked-down  
blocks revert to the locked state upon reset or power up the device (see Figure 8, “Block Locking  
State Diagram” on page 39).  
38  
Datasheet