AT52SC1283J-70CI ATMEL [ATMEL Corporation], AT52SC1283J-70CI Datasheet - Page 8

• Manufacturer Part Number: AT52SC1283J-70CI
• Description: 128-Mbit Flash + 32-Mbit/64-Mbit
• Manufacturer: ATMEL [ATMEL Corporation]

6.12.1
6.12.2
8
AT52SC1283J/1284J [Preliminary]
Softlock and Unlock
Hardlock and Write Protect (WP)
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.
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.
To disable the Hardlock sector protection mode, the chip must be either reset or power cycled.
Table 6-1.
V
V
V
V
V
V
V
V
V
• When the WP pin is low and the Hardlock protection mode is enabled, the sector cannot be
• When the WP pin is high, the Hardlock protection mode is overridden and the sector can be
PP
CC
CC
CC
CC
CC
CC
CC
IL
unlocked and the contents of the sector is read-only.
unlocked via the Unlock command.
Hardlock and Softlock Protection Configurations in Conjunction with WP
WP
0
0
0
1
1
1
1
x
Hard-
lock
0
0
1
0
0
1
1
x
Soft-
lock
0
1
1
0
1
0
1
x
Allowed?
Erase/
Prog
Yes
Yes
Yes
No
No
No
No
No
Comments
No sector is locked
Sector is Softlocked. The
Unlock command can unlock
the sector.
Hardlock protection mode is
enabled. The sector cannot be
unlocked.
No sector is locked.
Sector is Softlocked. The
Unlock command can unlock
the sector.
Hardlock protection mode is
overridden and the sector is
not locked.
Hardlock protection mode is
overridden and the sector can
be unlocked via the Unlock
command.
Erase and Program Operations
cannot be performed.
3530B–STKD–2/4/05