AM29DL323GB90EI AMD (ADVANCED MICRO DEVICES), AM29DL323GB90EI Datasheet - Page 17
AM29DL323GB90EI
Manufacturer Part Number
AM29DL323GB90EI
Description
Flash Memory IC
Manufacturer
AMD (ADVANCED MICRO DEVICES)
Datasheets
1.AM29DL323GB90EI.pdf
(58 pages)
2.AM29DL323GB90EI.pdf
(53 pages)
3.AM29DL323GB90EI.pdf
(58 pages)
Specifications of AM29DL323GB90EI
Memory Configuration
4M X 8 / 2M X 16 Bit
Supply Voltage Max
3.6V
Access Time, Tacc
90nS
Mounting Type
Surface Mount
Supply Voltage
3V
Available stocks
Company
Part Number
Manufacturer
Quantity
Price
Company:
Part Number:
AM29DL323GB90EI
Manufacturer:
TDK
Quantity:
14 000
It is possible to determine whether a sector is pro-
tected or unprotected. See the Autoselect Mode sec-
tion 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 bottom-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 8K Byte
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 “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.
March 26, 2004
ID
. This function is one of two provided by the
IL
IH
on the WP#/ACC pin, the de-
on the WP#/ACC pin, the de-
A D V A N C E
Am29DL32xG
I N F O R M A T I O N
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 Tables
7 and 8).
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 V
merly protected sectors can be programmed or erased
by selecting the sector addresses. Once V
moved from the RESET# pin, all the previously pro-
tected sectors are protected again. Figure 1 shows the
algorithm, and Figure 24 shows the timing diagrams,
for this feature.
Notes:
1. All protected sectors unprotected (If WP#/ACC = V
2. All previously protected sectors are protected once
Figure 1. Temporary Sector Unprotect Operation
outermost boot sectors will remain protected).
again.
ID
(8.5 V – 12.5 V). During this mode, for-
Unprotect Completed
Program Operations
Temporary Sector
Perform Erase or
RESET# = V
RESET# = V
(Note 1)
(Note 2)
START
ID
IH
ID
is re-
IL
,
17