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
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
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