am42dl6402g Meet Spansion Inc., am42dl6402g Datasheet - Page 20

• Manufacturer Part Number: am42dl6402g
• Description: 64 Mbit 8m X8bit/4m X16bit Flash Memory And Sram Preliminary
• Manufacturer: Meet Spansion Inc.

method described in “Sector/Sector Block Protection
and Unprotection”.
If the system asserts V
vice reverts to whether sectors 0, 1, 140, and 141
were last set to be protected or unprotected. That is,
sector protection or unprotection for these sectors de-
pends on whether they were last protected or unpro-
tected using the method described in “Sector/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.
January 31, 2003
WP# Input
Voltage
V
V
V
HH
IH
IL
Table 7. WP#/ACC Modes
Disables programming and erasing in
SA0, SA1, SA140, and SA141
Enables programming and erasing in
SA0, SA1, SA140, and SA141
Enables accelerated programming
(ACC). See “Accelerated Program
Operation” on page 12.
IH
on the WP#/ACC pin, the de-
Device
Mode
P R E L I M I N A R Y
Am42DL6402G
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 Table
6).
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 1 shows the algorithm, and
Figure 26 shows the timing diagrams, for this feature.
If the WP#/ACC pin is at V
141 will remain protected during the Temporary sector
Unprotect 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, 1, 140, and 141 will remain protected).
again.
V
ID
. During this mode, formerly protected
Unprotect Completed
Program Operations
Temporary Sector
Perform Erase or
RESET# = V
RESET# = V
(Note 1)
(Note 2)
ID
START
IL
is removed from the RE-
, sectors 0, 1, 140, and
ID
IH
IL
,
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