L320MT90QI Advanced Micro Devices, L320MT90QI Datasheet - Page 18

• Manufacturer Part Number: L320MT90QI
• Description: 32 Megabit 2 M X 16-bit/4 M X 8-bit Mirrorbit 3.0 Volt-only Boot Sector Flash Memory - Advanced Micro Devices
• Manufacturer: Advanced Micro Devices

If the system asserts V
vice reverts to whether the top or bottom two sectors
were previously set to be protected or unprotected
using the method described in “Sector Group Protec-
tion and Unprotection”. Note: No external pullup is
necessary since the WP#/ACC pin has internal pullup
to V
Temporary Sector Group Unprotect
(Note: In this device, a sector group consists of four adjacent
sectors that are protected or unprotected at the same time
(see
This feature allows temporary unprotection of previ-
ously protected sector groups to change data in-sys-
tem. The Sector Group Unprotect mode is activated by
setting the RESET# pin to
merly protected sector groups can be programmed or
erased by selecting the sector group addresses. Once
V
ously protected sector groups are protected again.
Figure 1 shows the algorithm, and Figure 23 shows
the timing diagrams, for this feature.
18
ID
CC
is removed from the RESET# pin, all the previ-
Table
6).
IH
on the WP#/ACC pin, the de-
V
ID
. During this mode, for-
D A T A S H E E T
Am29LV320MT/B
Notes:
1. All protected sector groups unprotected (If WP# = V
2. All previously protected sector groups are protected
the first or last sector will remain protected).
once again.
Figure 1. Temporary Sector Group
Unprotect Operation
Program Operations
Completed (Note 2)
Temporary Sector
Perform Erase or
Group Unprotect
RESET# = V
RESET# = V
(Note 1)
START
ID
IH
May 16, 2003
IL
,