AM29LV642D AMD [Advanced Micro Devices], AM29LV642D Datasheet - Page 23

• Manufacturer Part Number: AM29LV642D
• Manufacturer: AMD [Advanced Micro Devices]

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 Table 5)).
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 V
this mode, formerly protected sector groups can be
programmed or erased by selecting the sector group
addresses. Once V
pin, all the previously protected sector groups are
protected again. Figure 1 shows the algorithm, and
Figure 21 shows the timing diagrams, for this feature.
May 5, 2006 25022A2
ID
is removed from the RESET#
ID
(8.5 V – 12.5 V). During
D A T A
Am29LV642D
S H E E T
Notes:
1. All protected sector groups unprotected.
2. All previously protected sector groups are 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
21