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参数资料
| 型号： | AT45DB081D |
| 厂商： | Atmel Corp. |
| 英文描述： | 8-megabit 2.5-volt or 2.7-volt DataFlash |
| 中文描述： | 8兆位2.5伏或2.7伏的DataFlash |
| 文件页数： | 18/53页 |
| 文件大小： | 1105K |
| 代理商： | AT45DB081D |
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18
3596E–DFLASH–02/07
AT45DB081D
10. Security Features
10.1
Sector Lockdown
The device incorporates a Sector Lockdown mechanism that allows each individual sector to be
permanently locked so that it becomes read only. This is useful for applications that require the
ability to permanently protect a number of sectors against malicious attempts at altering program
code or security information.
Once a sector is locked down, it can never be erased or pro-
grammed, and it can never be unlocked.
To issue the Sector Lockdown command, the CS pin must first be asserted as it would be for
any other command. Once the CS pin has been asserted, the appropriate 4-byte opcode
sequence must be clocked into the device in the correct order. The 4-byte opcode sequence
must start with 3DH and be followed by 2AH, 7FH, and 30H. After the last byte of the command
sequence has been clocked in, then three address bytes specifying any address within the sec-
tor to be locked down must be clocked into the device. After the last address bit has been
clocked in, the CS pin must then be deasserted to initiate the internally self-timed lockdown
sequence.
The lockdown sequence should take place in a maximum time of t
P
, during which time the Status
Register will indicate that the device is busy. If the device is powered-down before the comple-
tion of the lockdown sequence, then the lockdown status of the sector cannot be guaranteed. In
this case, it is recommended that the user read the Sector Lockdown Register to determine the
status of the appropriate sector lockdown bits or bytes and reissue the Sector Lockdown com-
mand if necessary.
Figure 10-1.
Sector Lockdown
Command
Byte 1
Byte 2
Byte 3
Byte 4
Sector Lockdown
3DH
2AH
7FH
30H
Opcode
Byte 1
Opcode
Byte 2
Opcode
Byte 3
Opcode
Byte 4
CS
Address
Bytes
Address
Bytes
Address
Bytes
Each transition
represents
8
b
its
SI
相关PDF资料 |
PDF描述 |
|---|---|
| AT45DB081D_07 | 8-megabit 2.5-volt or 2.7-volt DataFlash |
| AT45DB081D-MU | 8-megabit 2.5-volt or 2.7-volt DataFlash |
| AT45DB081D-MU-2.5 | 8-megabit 2.5-volt or 2.7-volt DataFlash |
| AT45DB081D-SSU | 8-megabit 2.5-volt or 2.7-volt DataFlash |
| AT45DB081D-SSU-2.5 | 8-megabit 2.5-volt or 2.7-volt DataFlash |
相关代理商/技术参数 |
参数描述 |
|---|---|
| AT45DB081D_07 | 制造商:ATMEL 制造商全称:ATMEL Corporation 功能描述:8-megabit 2.5-volt or 2.7-volt DataFlash |
| AT45DB081D_08 | 制造商:ATMEL 制造商全称:ATMEL Corporation 功能描述:8-megabit 2.5-volt or 2.7-volt DataFlash |
| AT45DB081D_09 | 制造商:ATMEL 制造商全称:ATMEL Corporation 功能描述:8-megabit 2.5-volt or 2.7-volt DataFlash |
| AT45DB081D_13 | 制造商:AD 制造商全称:Analog Devices 功能描述:8-megabit 2.5V or 2.7V DataFlash |
| AT45DB081D-DWF | 制造商:Adesto Technologies Corporation 功能描述:WHOLE WAFER, NO BACKGRIND - Gel-pak, waffle pack, wafer, diced wafer on film |
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