AM29LV320D SPANSION [SPANSION], AM29LV320D Datasheet - Page 18

• Manufacturer Part Number: AM29LV320D
• Description: 32 Megabit (4 M x 8-Bit/2 M x 16-Bit) CMOS 3.0 Volt-only, Boot Sector Flash Memory
• Manufacturer: SPANSION [SPANSION]

compatible with programmer routines written
for earlier 3.0 volt-only AMD flash devices. For
detailed information, contact an AMD represen-
tative.
The device is shipped with all sectors unpro-
tected. AMD offers the option of programming
and protecting sectors at its factory prior to
shipping the device through AMD’s Express-
Flash™ Service. Contact an AMD representative
for details.
It is possible to determine whether a sector is
protected or unprotected. See
Mode” on page 16
Write Protect (WP#)
The Write Protect function provides a hardware
method of protecting certain boot sectors with-
out using V
vided by the WP#/ACC pin.
If the system asserts V
the device disables program and erase func-
tions in the two “outermost” 8 Kbyte boot sec-
tors independently of whether those sectors
w er e p r ote cte d or un pro tec ted usi ng the
method described in
tection and Unprotection” on page
outermost 8 Kbyte boot sectors are the two
sectors containing the lowest addresses in a
bottom-boot-configured device, or the two sec-
tors containing the highest addresses in a
top-boot-configured device.
If the system asserts V
the device reverts to whether the two outer-
most 8K Byte boot sectors were last set to be
protected or unprotected. That is, sector pro-
tection or unprotection for these two sectors
depends on whether they were last protected
or unprotected using the method described in
“Sector/Sector Block Protection and Unprotec-
tion” on page
Note that the WP#/ACC pin must not be left
floating or unconnected; inconsistent behavior
of the device may result.
Temporary Sector Unprotect
This feature allows temporary unprotection of
previously protected sectors to change data
in-system. The Sector Unprotect mode is acti-
vated by setting the RESET# pin to V
– 12.5 V). During this mode, formerly pro-
tected sectors can be programmed or erased by
selecting the sector addresses. Once V
moved from the RESET# pin, all the previously
protected sectors are protected again.
on page 18
18
ID
shows the algorithm, and
. This function is one of two pro-
17.
for details.
“Sector/Sector Block Pro-
IL
IH
on the WP#/ACC pin,
on the WP#/ACC pin,
“Autoselect
17. The two
ID
Figure 1,
ID
(11.5 V
Figure
is re-
Am29LV320D
23, on page 46
this feature.
Notes:
1. All protected sectors unprotected (If WP#/ACC =
2. All previously protected sectors are protected
Figure 1. Temporary Sector Unprotect
V
once again.
IL
, outermost boot sectors remain protected).
Unprotect Completed
shows the timing diagrams, for
Temporary Sector
Perform Erase or
Operation
RESET# = V
RESET# = V
(Note 1)
(Note 2)
Program
START
ID
November 15, 2004
IH