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参数资料
型号： PH28F256L18T85
厂商： INTEL CORP
元件分类： PROM
英文描述： StrataFlash Wireless Memory
中文描述： 16M X 16 FLASH 1.8V PROM, 85 ns, PBGA79
封装： 0.75 MM PITCH, LEAD FREE, VFBGA-79
文件页数： 66/106页
文件大小： 1272K
代理商： PH28F256L18T85
Intel StrataFlash Wireless Memory (L18)
April 2005
66
Intel StrataFlash Wireless Memory (L18)
Order Number: 251902, Revision: 009
Datasheet
13.0
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.
13.1
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, V
PP
data security can be used to inhibit program and erase operations
(see
Section 11.6, “Program Protection” on page 63
and
Section 12.4, “Erase Protection” on
page 65
).
13.1.1
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 9.2, “Device Commands” on page 47
and
Figure 45, “Block Lock Operations Flowchart” on page 91
). 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 V
PP
. The block lock bits
may be modified and/or read even if V
PP
is below V
PPLK
.
13.1.2
Unlock Block
The Unlock Block command is used to unlock blocks (see
Section 9.2, “Device Commands” on
page 47
). 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 28, “Block Locking State Diagram” on
page 67
).
13.1.3
Lock-Down Block
A locked or unlocked block can be locked-down by writing the Lock-Down Block command
sequence (see
Section 9.2, “Device Commands” on page 47
). 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 V
IL
. Locked-down
blocks revert to the locked state upon reset or power up the device (see
Figure 28, “Block Locking
State Diagram” on page 67
).
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