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参数资料
| 型号： | AT45DB081D-SU-2.5 |
| 厂商： | ATMEL CORP |
| 元件分类： | DRAM |
| 英文描述： | 8-megabit 2.5-volt or 2.7-volt DataFlash |
| 中文描述： | 8M X 1 FLASH 2.7V PROM, PDSO8 |
| 封装： | 0.208 INCH, GREEN, PLASTIC, EIAJ, SOIC-8 |
| 文件页数： | 13/53页 |
| 文件大小： | 1105K |
| 代理商： | AT45DB081D-SU-2.5 |
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13
3596E–DFLASH–02/07
AT45DB081D
9.
Hardware Controlled Protection
Sectors specified for protection in the Sector Protection Register and the Sector Protection Reg-
ister itself can be protected from program and erase operations by asserting the
W
P pin and
keeping the pin in its asserted state. The Sector Protection Register and any sector specified for
protection cannot be erased or reprogrammed as long as the
W
P pin is asserted. In order to
modify the Sector Protection Register, the
W
P pin must be deasserted. If the
W
P pin is perma-
nently connected to GND, then the content of the Sector Protection Register cannot be changed.
If the
W
P pin is deasserted, or permanently connected to V
CC
, then the content of the Sector
Protection Register can be modified.
The
W
P pin will override the software controlled protection method but only for protecting the
sectors. For example, if the sectors were not previously protected by the Enable Sector Protec-
tion command, then simply asserting the
W
P pin would enable the sector protection within the
maximum specified t
W
PE
time.
W
hen the
W
P pin is deasserted; however, the sector protection
would no longer be enabled (after the maximum specified t
W
PD
time) as long as the Enable Sec-
tor Protection command was not issued while the
W
P pin was asserted. If the Enable Sector
Protection command was issued before or while the
W
P pin was asserted, then simply deassert-
ing the
W
P pin would not disable the sector protection. In this case, the Disable Sector
Protection command would need to be issued while the
W
P pin is deasserted to disable the sec-
tor protection. The Disable Sector Protection command is also ignored whenever the
W
P pin is
asserted.
A noise filter is incorporated to help protect against spurious noise that may inadvertently assert
or deassert the
W
P pin.
The table below details the sector protection status for various scenarios of the
W
P pin, the
Enable Sector Protection command, and the Disable Sector Protection command.
Figure 9-1.
W
P Pin and Protection Status
WP
1
2
3
Table 9-1.
W
P Pin and Protection Status
Time
Period
WP Pin
Enable Sector Protection
Command
Disable Sector
Protection Command
Sector Protection
Status
Sector
Protection
Register
1
High
Command Not Issued Previously
–
Issue Command
X
Issue Command
–
Disabled
Disabled
Enabled
Read/
W
rite
Read/
W
rite
Read/
W
rite
2
Low
X
X
Enabled
Read Only
3
High
Command Issued During Period 1
or 2
–
Issue Command
Not Issued Yet
Issue Command
–
Enabled
Disabled
Enabled
Read/
W
rite
Read/
W
rite
Read/
W
rite
相关PDF资料 |
PDF描述 |
|---|---|
| AT45DB081 | 8-Megabit 2.7-volt Only Serial DataFlash |
| AT45DB081-RC | 8-Megabit 2.7-volt Only Serial DataFlash |
| AT45DB081-RI | 8-Megabit 2.7-volt Only Serial DataFlash |
| AT45DB081-TC | 8-Megabit 2.7-volt Only Serial DataFlash |
| AT45DB081-TI | 8-Megabit 2.7-volt Only Serial DataFlash |
相关代理商/技术参数 |
参数描述 |
|---|---|
| AT45DB081D-SU-SL383 | 制造商:Atmel Corporation 功能描述:DATAFLASH, 8MB, SERIAL, 2.5V - |
| AT45DB081D-SU-SL383-AD | 功能描述:DATA FLASH 制造商:adesto technologies 系列:- 包装:剪切带（CT） 零件状态:Digi-Key 停止供應 存储器类型:非易失 存储器格式:闪存 技术:FLASH 存储容量:8Mb （264 字节 x 4096 页） 时钟频率:66MHz 写周期时间 - 字，页:4ms 存储器接口:SPI 电压 - 电源:2.7 V ~ 3.6 V 工作温度:-40°C ~ 85°C（TC） 安装类型:表面贴装 封装/外壳:8-SOIC（0.154"，3.90mm 宽） 供应商器件封装:8-SOIC 标准包装:1 |
| AT45DB081D-SU-SL954 | 制造商:Atmel Corporation 功能描述:Flash Serial-SPI 3V/3.3V 8Mbit 6ns 8-Pin SOIC EIAJ T/R 制造商:Adesto Technologies Corporation 功能描述:IC FLASH 8MBIT 66MHZ 8SOIC 制造商:Atmel 功能描述:Flash Serial-SPI 3V/3.3V 8Mbit 6ns 8-Pin SOIC EIAJ T/R |
| AT45DB081DSU-SL954 | 制造商:Atmel 功能描述:Flash Serial-SPI 3V/3.3V 8Mbit 6ns 8-Pin SOIC EIAJ T/R |
| AT45DB081D-SU-SL955 | 制造商:Adesto Technologies Corporation 功能描述:8-SOIC-W, IND TEMP, 2.7V, T&R, 256 BYTE PAGE - Tape and Reel 制造商:Adesto Technologies Corporation 功能描述:IC FLASH 8MBIT 66MHZ 8SOIC 制造商:Adesto Technologies Corporation 功能描述:Flash 8M, 66MHz 2.7-3.6V DataFlash |
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