参数资料
型号: RCPXA272FC0312
厂商: INTEL CORP
元件分类: 微控制器/微处理器
英文描述: 312 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: 122/138页
文件大小: 1048K
代理商: RCPXA272FC0312
Part 2: Flash Device Operations
Flash Security Modes
84
Intel PXA27x Processor Family Memory Subsystem
13.1.4
Flash Block Lock Status
The Read Device Identifier command is used to determine a block’s lock status (see Section 15.2,
“Flash Read Device Identifier” on page 95). Data bits DQ[1:0] display the addressed block’s lock
status; DQ0 is the addressed block’s lock bit, while DQ1 is the addressed block’s lock-down bit.
13.1.5
Flash Block Locking During Suspend
Block lock and unlock changes can be performed during an erase suspend. To change block
locking during an erase operation, first issue the Erase Suspend command. Monitor the Status
Register until SR.7 and SR.6 are set, indicating the flash is suspended and ready to accept another
command.
Next, write the desired lock command sequence to a block, which changes the lock state of that
block. After completing block lock or unlock operations, resume the erase operation using the
Erase Resume command.
Note:
A Lock Block Setup command followed by any command other than Lock Block, Unlock Block,
or Lock-Down Block produces a command sequence error and set Status Register bits SR.4 and
SR.5. If a command sequence error occurs during an erase suspend, SR.4 and SR.5 remains set,
even after the erase operation is resumed. Unless the Status Register is cleared using the Clear
Status Register command before resuming the erase operation, possible erase errors may be
masked by the command sequence error.
If a block is locked or locked-down during an erase suspend of the same block, the lock status bits
change immediately. However, the erase operation completes when it is resumed. Block lock
operations cannot occur during a program suspend.
Figure 27.
Flash Block Locking State Diagram
[X00]
[X01]
Power-Up/Reset
Unlocked
Locked
[011]
[111]
[110]
Locked-
Down4,5
Software
Locked
[011]
Hardware
Locked5
Unlocked
F-WP# Hardware Control
Notes:
1. [a,b,c] represents [F-WP#, D1, D0]. X = Don’t Care.
2. D1 indicates block Lock-down status. D1 = ‘0’, Lock-down has not been issued to
this block. D1 = ‘1’, Lock-down has been issued to this block.
3. D0 indicates block lock status. D0 = ‘0’, block is unlocked. D0 = ‘1’, block is locked.
4. Locked-down = Hardware + Software locked.
5. [011] states should be tracked by system software to determine difference
between Hardware Locked and Locked-Down states.
Software Block Lock (0x60/0x01) or Software Block Unlock (0x60/0xD0)
Software Block Lock-Down (0x60/0x2F)
F-WP# hardware control
相关PDF资料
PDF描述
RCPXA271FC0312 312 MHz, MICROPROCESSOR, PBGA336
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