am45dl3208g Advanced Micro Devices, am45dl3208g Datasheet - Page 22

• Manufacturer Part Number: am45dl3208g
• Description: Stacked Multi-chip Package Mcp Flash Memory And Sram
• Manufacturer: Advanced Micro Devices

ously protected sectors must be individually re-pro-
tected. To change data in protected sectors efficiently,
the temporary sector unprotect function is available.
See “Temporary Sector
The device is shipped with all sectors unprotected.
AMD offers the option of programming and protecting
sectors at its factory prior to shipping the device
through AMD’s ExpressFlash™ Service. Contact an
AMD representative for details.
It is possible to determine whether a sector is pro-
tected or unprotected. See the Sector/Sector Block
Protection and Unprotection section for details.
Write Protect (WP#)
The Write Protect function provides a hardware
method of protecting certain boot sectors without
using V
WP#/ACC pin.
If the system asserts V
vice disables program and erase functions in the two
“outermost” 8 Kbyte boot sectors independently of
whether those sectors were protected or unprotected
using the method described in “Sector/Sector Block
Protection and Unprotection”. The two outermost 8
Kbyte boot sectors are the two sectors containing the
lowest addresses in a top-boot-configured device, or
the two sectors containing the highest addresses in a
top-boot-configured device.
If the system asserts V
vice reverts to whether the two outermost 8 Kbyte boot
sectors were last set to be protected or unprotected.
That is, sector protection or unprotection for these two
sectors depends on whether they were last protected
or unprotected using the method described in “Sec-
tor/Sector Block Protection and Unprotection”.
Note that the WP#/ACC pin must not be left floating or
unconnected; inconsistent behavior of the device may
result.
20
ID
. This function is one of two provided by the
IL
IH
Unprotect”.
on the WP#/ACC pin, the de-
on the WP#/ACC pin, the de-
P R E L I M I N A R Y
Am45DL3208G
Temporary Sector Unprotect
(Note: For the following discussion, the term “sector”
applies to both sectors and sector blocks. A sector
block consists of two or more adjacent sectors that are
protected or unprotected at the same time (see
9).
This feature allows temporary unprotection of previ-
ously protected sectors to change data in-system. The
Sector Unprotect mode is activated by setting the RE-
SET# pin to
sectors can be programmed or erased by selecting the
sector addresses. Once V
SET# pin, all the previously protected sectors are
protected again.
Figure 26
If the WP#/ACC pin is at V
will remain protected during the Temporary sector Un-
protect mode.
Notes:
1. All protected sectors unprotected (If WP#/ACC = V
2. All previously protected sectors are protected once
Figure 1. Temporary Sector Unprotect Operation
sectors 0 and 1 (bottom boot) or 69 and 70 (top boot)
will remain protected).
again.
shows the timing diagrams, for this feature.
V
ID
. During this mode, formerly protected
Figure 1
Unprotect Completed
Program Operations
Temporary Sector
Perform Erase or
RESET# = V
RESET# = V
(Note 1)
(Note 2)
ID
START
IL
shows the algorithm, and
, sectors 0, 1, 69, and 70
is removed from the RE-
ID
IH
March 12, 2004
Table
IL
,