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AT52SC1283J 数据表(PDF) 8 Page - ATMEL Corporation

部件名 AT52SC1283J
功能描述  128-Mbit Flash 32-Mbit/64-Mbit
PDF  52 Pages
Scroll/Zoom Zoom In 100%  Zoom Out
制造商  ATMEL [ATMEL Corporation]
网页  http://www.atmel.com
标志 ATMEL - ATMEL Corporation

AT52SC1283J 数据表(HTML) 8 Page - ATMEL Corporation

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3530B–STKD–2/4/05
AT52SC1283J/1284J [Preliminary]
6.12.1
Softlock and Unlock
The Softlock protection mode can be disabled by issuing a two-bus cycle Unlock command to
the selected sector. Once a sector is unlocked, its contents can be erased or programmed. To
enable the Softlock protection mode, a two-bus cycle Softlock command must be issued to the
selected sector.
6.12.2
Hardlock and Write Protect (WP)
The Hardlock sector protection mode operates in conjunction with the Write Protection (WP) pin.
The Hardlock sector protection mode can be enabled by issuing a two-bus cycle Hardlock soft-
ware command to the selected sector. The state of the Write Protect pin affects whether the
Hardlock protection mode can be overridden.
• When the WP pin is low and the Hardlock protection mode is enabled, the sector cannot be
unlocked and the contents of the sector is read-only.
• When the WP pin is high, the Hardlock protection mode is overridden and the sector can be
unlocked via the Unlock command.
To disable the Hardlock sector protection mode, the chip must be either reset or power cycled.
Table 6-1.
Hardlock and Softlock Protection Configurations in Conjunction with WP
VPP
WP
Hard-
lock
Soft-
lock
Erase/
Prog
Allowed?
Comments
V
CC
0
0
0
Yes
No sector is locked
VCC
00
1
No
Sector is Softlocked. The
Unlock command can unlock
the sector.
VCC
01
1
No
Hardlock protection mode is
enabled. The sector cannot be
unlocked.
V
CC
1
0
0
Yes
No sector is locked.
V
CC
10
1
No
Sector is Softlocked. The
Unlock command can unlock
the sector.
V
CC
11
0
Yes
Hardlock protection mode is
overridden and the sector is
not locked.
V
CC
11
1
No
Hardlock protection mode is
overridden and the sector can
be unlocked via the Unlock
command.
V
IL
xx
x
No
Erase and Program Operations
cannot be performed.



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