AM29F160DB-90EI Spansion Inc., AM29F160DB-90EI Datasheet - Page 15

• Manufacturer Part Number: AM29F160DB-90EI
• Description: Flash Memory IC
• Manufacturer: Spansion Inc.

Specifications of AM29F160DB-90EI

• Memory Size: 16Mbit
• Memory Configuration: 2M X 8 / 1M X 16
• Ic Interface Type: Parallel
• Access Time: 90ns
• No. Of Pins: 48
• Operating Temperature Range: -40°C To +85°C
• Termination Type: SMD
• Memory Voltage, Vcc: 5V
• Lead Free Status / RoHS Status: Contains lead / RoHS non-compliant

Write Protect (WP#)
The Write Protect function provides a hardware
method of protecting the 16 Kbyte boot sector without
using V
If the system asserts V
disables program and erase functions for the 16 Kbyte
boot sector (SA34 for top boot device and SA0 for bot-
tom boot device) independently of whether those sec-
tors were protected or unprotected using the method
described in “Sector Protection/Unprotection”.
If the system asserts V
reverts to whether the 16 Kbyte boot sector was previ-
ously set to be protected or unprotected using the
method described in “Sector Protection/Unprotection”.
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
sectors can be programmed or erased by selecting the
sector addresses. Note, however, that the boot sector
will still be protected if WP# is asserted low. Once V
is removed from the RESET# pin, all the previously pro-
tected sectors are protected again. Figure shows the
algorithm, and Figure 19 shows the timing diagrams,
for this feature.
ID
.
ID
. During this mode, formerly protected
IH
IL
on the WP# pin, the device
on the WP# pin, the device
Am29F160D
ID
Notes:
1. All protected sectors unprotected. Boot sector remains
2. All previously protected sectors are protected once again.
Figure 1. Temporary Sector Unprotect Operation
protected if WP# is low.
Unprotect Completed
Program Operations
Temporary Sector
Perform Erase or
RESET# = V
RESET# = V
(Note 1)
(Note 2)
START
ID
IH
13