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参数资料
| 型号： | PF38F40L0YUQ0 |
| 厂商： | NUMONYX |
| 元件分类： | PROM |
| 英文描述： | 16M X 16 FLASH 1.8V PROM, PBGA88 |
| 封装： | 8 X 11 MM, 1 MM HEIGHT, ROHS COMPLIANT, VFBGA-88 |
| 文件页数： | 57/99页 |
| 文件大小： | 1419K |
| 代理商： | PF38F40L0YUQ0 |
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Intel StrataFlash Wireless Memory (L18)
Intel StrataFlash Wireless Memory (L18) with A/D-Multiplexed I/O
Datasheet
July 2006
60
Order Number: 313295-002US
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, VPP data security can be used to
inhibit program and erase operations (see Section 11.6, “Program Protection” on
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
Figure 37, “Block Lock Operations Flowchart” on page 85).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.
13.1.2
Unlock Block
The Unlock Block command is used to unlock blocks (see Section 9.2, “Device
Commands” on page 40). 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
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 40). 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
Table 20. Block Locking
V
PP
WP#
RST#
Block Write Protection
Block Lock Bits
XX
VIL
All blocks write/erase protected
Block lock bits may not be changed
≤ VPPLK
VIL
VIH
All blocks write/erase protected
Lock-Down block states may
not be
changed
≤ V
PPLK
VIH
All blocks write/erase protected
All Lock-Down block states
may be
changed
> VPPLK
VIL
VIH
All Lock-Down and Locked blocks
write/erase protected
Lock-Down block states may
not be
changed
> VPPLK
VIH
All Lock-Down and Locked blocks
write/erase protected
All Lock-Down block states
may be
changed
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