AM29SL160C AMD [Advanced Micro Devices], AM29SL160C Datasheet - Page 18

• Manufacturer Part Number: AM29SL160C
• Description: 16 Megabit CMOS 1.8 Volt-only Super Low Voltage Flash Memory
• Manufacturer: AMD [Advanced Micro Devices]

The primary method requires V
only, and is implemented either in-system or via pro-
gramming equipment.
algorithms and
diagram. This method uses standard microprocessor
bus cycle timing. For sector unprotect, all unprotected
sectors must first be protected prior to the first sector
unprotect write cycle.
The alternate method intended only for programming
equipment requires V
This method is compatible with programmer routines
written for earlier 3.0 volt-only AMD flash devices. Pub-
lication number 21622 contains further details. Contact
an AMD representative to request the document con-
taining further details.
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 protected
or unprotected. See
details.
Write Protect (WP#)
The write protect function provides a hardware method
of protecting certain boot sectors without using V
This function is one of two provided by the WP#/ACC
pin.
If the system asserts V
device disables program and erase functions in the two
“outermost” 8 Kbyte boot sectors independently of
whether those sectors were protected or unprotected
18
Figure 24, on page 45
“Autoselect Mode” on page 16
ID
Figure 1, on page 19
on address pin A9 and OE#.
IL
on the WP#/ACC pin, the
ID
on the RESET# pin
shows the timing
shows the
Am29SL160C
for
ID
.
using the method described in
Protection and Unprotection” on page
ermost 8 Kbyte boot sectors are the two sectors
containing the lowest addresses in a bottom-boot-con-
figured device, or the two sectors containing the
highest addresses in a top-boot-configured device.
If the system asserts V
device reverts to whether the two outermost 8 Kbyte
boot sectors were last set to be protected or unpro-
tected. That is, sector protection or unprotection for
these two sectors depends on whether they were last
protected or unprotected using the method described
in
on page
Note that if the system asserts V
pin, all sectors, including the two outermost sectors,
are unprotected. V
system programming of the device during system pro-
duction. It is advisable, therefore, not to assert V
this pin after the system has been placed in the field for
use. If faster programming is desired, the system may
use the unlock bypass program command sequence.
Temporary Sector Unprotect
This feature allows temporary unprotection of previ-
ously protected sectors to change data in-system. The
Sector Unprotect mode is activated by setting the
RESET# pin to V
tected sectors can be programmed or erased by
selecting the sector addresses. Once V
from the RESET# pin, all the previously protected
sectors are protected again.
shows the algorithm, and
the timing diagrams, for this feature.
“Sector/Sector Block Protection and Unprotection”
17.
ID
HH
. During this mode, formerly pro-
is intended for accelerated in-
IH
Figure 22, on page 44
on the WP#/ACC pin, the
Figure 2, on page 20
“Sector/Sector Block
HH
November 1, 2004
on the WP#/ACC
17. The two out-
ID
is removed
shows
HH
on