參數(shù)資料
型號(hào)： GE28F640W30TD70
廠商： INTEL CORP
元件分類： PROM
英文描述： 4M X 16 FLASH 1.8V PROM, 70 ns, PBGA56
封裝： 0.75 MM PITCH, VFBGA-56
文件頁(yè)數(shù)： 76/104頁(yè)
文件大?。?/td> 1443K
代理商： GE28F640W30TD70
28F640W30, 28F320W30, 28F128W30
Datasheet
Intel Wireless Flash Memory (W30)
June 2005
Order Number: 290702, Revision: 011
73
13.0
Security Modes
The W30 flash memory device offers both hardware and software security features to protect the
flash memory data.
To use the software security feature, execute the Lock Block command.
To use the hardware security feature, execute the Lock-Down Block command and assert the
WP# signal.
Refer to Figure 33, “Block Locking State Diagram” on page 74 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:
Software-only control of block locking (useful for frequently changed data blocks).
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, such as state [001]. In this syntax:
a= WP# value.
b = block lock-down status bit D1.
c = Block Lock status register bit D0.
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.
— When WP# is asserted, previously locked-down blocks return to lock-down.
— The lock-down status bit clears only when the flash device is reset or powered-down.
Block lock registers are not affected by the VPP level. These registers can be modified and read
even if VPP < VPPLK.
The locking status of each block can be set to locked, unlocked, and lock-down, as described in the
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