AM29LV320DT90EI AMD (ADVANCED MICRO DEVICES), AM29LV320DT90EI Datasheet - Page 20

• Manufacturer Part Number: AM29LV320DT90EI
• Description: Flash Memory IC
• Manufacturer: AMD (ADVANCED MICRO DEVICES)

Specifications of AM29LV320DT90EI

• Memory Configuration: 4M X 8 / 2M X 16 Bit
• Package/case: 48-TSOP
• Supply Voltage Max: 3.6V
• Leaded Process Compatible: No
• Peak Reflow Compatible (260 C): No
• Access Time, Tacc: 90nS
• Mounting Type: Surface Mount
• Lead Free Status / RoHS Status: Contains lead / RoHS non-compliant

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” on page 17. The two out-
ermost 8 Kbyte boot sectors are the two sectors con-
t a i n i n g
bottom-boot-configured device, or the two sectors con-
taining 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”
on page 17.
Note that the WP#/ACC pin must not be left floating or
unconnected; inconsistent behavior of the device may
result.
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 RE-
SET# pin to V
formerly protected sectors can be programmed or
18
ID
. This function is one of two provided by the
t h e
ID
(11.5 V – 12.5 V). During this mode,
l o w e s t
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on the WP#/ACC pin, the de-
on the WP#/ACC pin, the de-
a d d r e s s e s
D A T A S H E E T
i n
Am29LV320D
a
erased by selecting the sector addresses. Once V
removed from the RESET# pin, all the previously pro-
tected sectors are protected again.
18
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
shows the algorithm, and
outermost boot sectors remain protected).
again.
Unprotect Completed
Program Operations
Temporary Sector
Perform Erase or
RESET# = V
RESET# = V
(Note 1)
(Note 2)
START
Figure 23, on page 46
December 14, 2005
ID
IH
Figure 1, on page
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ID
,
is