L017D70VC Advanced Micro Devices, Inc., L017D70VC Datasheet - Page 16

• Manufacturer Part Number: L017D70VC
• Description: 16 Megabit (2 M x 8-bit) CMOS 3.0 Volt-only Uniform Sector Flash Memory
• Manufacturer: Advanced Micro Devices, Inc.

Hardware Data Protection
The command sequence requirement of unlock cycles
for programming or erasing provides data protection
18
Notes:
1. All protected sectors unprotected.
2. All previously protected sectors are protected once
Figure 2. Temporary Sector Unprotect Operation
again.
Unprotect Completed
Program Operations
Temporary Sector
Perform Erase or
RESET# = V
RESET# = V
(Note 1)
(Note 2)
START
ID
IH
Am29LV017D
against inadvertent writes (refer to Table 8 for com-
mand definitions). In addition, the following hardware
data protection measures prevent accidental erasure
or programming, which might otherwise be caused by
spurious 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-
IH
CC
LKO
during power
power-up and
.
CC
CC