參數(shù)資料
型號(hào)： PH28F128W18BD60A
廠商： INTEL CORP
元件分類： PROM
英文描述： 8M X 16 FLASH 1.8V PROM, 60 ns, PBGA56
封裝： 9 X 11 MM, 1 MM HEIGHT, LEAD FREE, VFBGA-56
文件頁(yè)數(shù)： 82/106頁(yè)
文件大?。?/td> 1496K
代理商： PH28F128W18BD60A
Intel
Wireless Flash Memory (W18)
Datasheet
Intel Wireless Flash Memory (W18)
07-Dec-2005
Order Number: 290701, Revision: 015
77
13.0
Security Modes
The Intel Wireless Flash Memory offers both hardware and software security features to protect the
flash data. The software security feature is used by executing the Lock Block command. The
hardware security feature is used by executing the Lock-Down Block command and by asserting
the WP# signal.
Refer to Figure 31, “Block Locking State Diagram” on page 78 for a state diagram of the flash
13.1
Block Lock Operations
Individual instant block locking protects code and data by allowing any block to be locked or
unlocked with no latency. This locking scheme offers two levels of protection. The first allows
software-only control of block locking (useful for frequently changed data blocks), while the
second requires hardware interaction before locking can be changed (protects infrequently changed
code blocks).
The following sections discuss the locking system operation. The term “state [abc]” specifies
locking states; for example, “state [001],” where a = WP# value, b = block lock-down status bit
D1, and c = Block Lock Status Register bit D0. Figure 31, “Block Locking State Diagram” on
page 78 defines possible locking states.
The following summarizes the locking functionality.
All blocks power-up in a locked state.
Unlock commands can unlock these blocks, and lock commands can lock them again.
The Lock-Down command locks a block and prevents it from being unlocked when WP# is
asserted.
— Locked-down blocks can be unlocked or locked with commands as long as WP# is
deasserted.
— The lock-down status bit is cleared only when the device is reset or powered-down.
Block lock registers are not affected by the VPP level. They may be modified and read even if VPP
≤ VPPLK.
Each block’s locking status can be set to locked, unlocked, and lock-down, as described in the
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