AM29F016B Advanced Micro Devices, AM29F016B Datasheet - Page 12

• Manufacturer Part Number: AM29F016B
• Description: 16 Megabit (2 M x 8-Bit) CMOS 5.0 Volt-only/ Uniform Sector Flash Memory
• Manufacturer: Advanced Micro Devices

12
Notes:
1. All protected sector groups unprotected.
2. All previously protected sector groups are protected
Figure 1. Temporary Sector Group Unprotect
once again.
Sector Group Unprotect
Program Operations
Completed (Note 2)
Operation
Perform Erase or
RESET# = V
RESET# = V
Temporary
(Note 1)
START
ID
IH
P R E L I M I N A R Y
21444B-8
Am29F016B
Hardware Data Protection
The command sequence requirement of unlock cycles
for programming or erasing provides data protection
against inadvertent writes (refer to the Command Defi-
nitions table). In addition, the following hardware data
protection measures prevent accidental erasure or pro-
gramming, which might otherwise be caused by spuri-
ous system level signals during V
power-down transitions, or from system noise.
Low V
When V
cept any write cycles. This protects data during V
power-up and power-down. The command register and
all internal program/erase circuits are disabled, and the
device resets. Subsequent writes are ignored until V
is greater than V
proper signals to the control pins to prevent uninten-
tional writes when V
Write Pulse “Glitch” Protection
Noise pulses of less than 5 ns (typical) on OE#, CE# or
WE# do not initiate a write cycle.
Logical Inhibit
Write cycles are inhibited by holding any one of OE#
= V
cle, CE# and WE# must be a logical zero while OE#
is a logical one.
Power-Up Write Inhibit
If WE# = CE# = V
up, the device does not accept commands on the
rising edge of WE#. The internal state machine is
a u t o m a ti c a l l y r e s e t to r e a d i n g a r ray d at a o n
power-up.
IL
, CE# = V
CC
CC
Write Inhibit
is less than V
IH
or WE# = V
LKO
IL
CC
. The system must provide the
and OE# = V
is greater than V
LKO
, the device does not ac-
IH
. To initiate a write cy-
CC
IH
power-up and
during power
LKO
.
CC
CC