参数资料
型号: RCPXA272FC0520
厂商: MARVELL SEMICONDUCTOR INC
元件分类: 微控制器/微处理器
英文描述: 520 MHz, MICROPROCESSOR, PBGA336
封装: 14 X 14 MM, 1.55 MM HEIGHT, 0.65 MM PITCH, LEAD FREE, CSP-336
文件页数: 121/138页
文件大小: 1048K
代理商: RCPXA272FC0520
Part 2: Flash Device Operations
Flash Security Modes
Intel PXA27x Processor Family Memory Subsystem
83
Flash Security Modes
13
The flash features security modes used to protect the code or data information stored in the flash
memory array. The following sections describe each security mode in detail.
13.1
Flash 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 F-WP#.
13.1.1
Flash 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 9.3, “Flash Command Definitions” on
Configuration Register command is issued after the Block Lock Setup command, the flash
configures the RCR instead.
Block lock and unlock operations are not affected by the voltage level on F-VPP. The block lock
bits may be modified and/or read even if F-VPP ≤ VPPLK.
13.1.2
Flash Unlock Block
The Unlock Block command is used to unlock blocks (see Section 9.3, “Flash Command
Definitions” on page 66). Unlocked blocks can be read, programmed, and erased. Unlocked blocks
return to a locked state when the flash 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 27, “Flash Block Locking State
13.1.3
Flash Lock-Down Block
A locked or unlocked block can be locked-down by writing the Lock-Down Block command
sequence (see Section 9.3, “Flash Command Definitions” on page 66). 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 F-WP# deasserted. To return an unlocked
block to locked-down state, a Lock-Down command must be issued prior to changing F-WP# to
VIL. Locked-down blocks revert to the locked state upon reset or power up the flash (see Figure 27,
相关PDF资料
PDF描述
RCPXA273FC0416 416 MHz, MICROPROCESSOR, PBGA336
RCPXA273FC0520 520 MHz, MICROPROCESSOR, PBGA336
RCPXA272FC0312 312 MHz, MICROPROCESSOR, PBGA336
RCPXA271FC0312 312 MHz, MICROPROCESSOR, PBGA336
RCPXA271FC0416 416 MHz, MICROPROCESSOR, PBGA336
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