AM29DL640H60WHEN AMD [Advanced Micro Devices], AM29DL640H60WHEN Datasheet - Page 18

• Manufacturer Part Number: AM29DL640H60WHEN
• Description: 64 Megabit (8 M x 8-Bit/4 M x 16-Bit) CMOS 3.0 Volt-only, Simultaneous Read/Write Flash Memory
• Manufacturer: AMD [Advanced Micro Devices]

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.
16
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,
dependent on whether they were last
protected or unprotected.
Enables accelerated programming
(ACC). See “Accelerated Program
Operation” on page 9.
IH
on the WP#/ACC pin, the de-
Device
Mode
Am29DL640H
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
Temporary Sector Unprotect mode is activated by set-
ting the RESET# pin to
protected sectors can be programmed or erased by
selecting the sector addresses. Once V
from the RESET# pin, all the previously protected sec-
tors are protected again. Figure 1 shows the algo-
rithm, and Figure 25 shows the timing diagrams, for
this feature. If the WP#/ACC pin is at V
140, and 141 will remain protected during the Tempo-
rary 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.
Unprotect Completed
Program Operations
Temporary Sector
Perform Erase or
V
RESET# = V
RESET# = V
ID
(Note 1)
(Note 2)
. During this mode, formerly
START
ID
IH
February 9, 2005
IL
ID
, sectors 0, 1,
is removed
IL
,