S71PL129JB0BAW9Z0 Spansion Inc., S71PL129JB0BAW9Z0 Datasheet - Page 43

• Manufacturer Part Number: S71PL129JB0BAW9Z0
• Manufacturer: Spansion Inc.

Specifications of S71PL129JB0BAW9Z0

• Lead Free Status / RoHS Status: Compliant

October 28, 2005 S71PL129Jxx_00_A8
Hardware Data Protection
The command sequence requirement of unlock cycles for programming or erasing
provides data protection against inadvertent writes. 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-up and power-down transitions, or from system noise.
Low V
When V
tects data during V
internal program/erase circuits are disabled, and the device resets to the read
mode. Subsequent writes are ignored until V
must provide the proper signals to the control pins to prevent unintentional writes
when V
Write Pulse “Glitch” Protection
Noise pulses of less than 3 ns (typical) on OE#, CE1#, CE2# or WE# do not ini-
tiate a write cycle.
Logical Inhibit
Write cycles are inhibited by holding any one of OE# = V
or WE# = V
zero while OE# is a logical one.
Power-Up Write Inhibit
If WE# = CE# (CE1#, CE2# in PL129J) = V
the device does not accept commands on the rising edge of WE#. The internal
state machine is automatically reset to the read mode on power-up.
CC
CC
CC
is greater than V
is less than V
A d v a n c e
Write Inhibit
IH
. To initiate a write cycle, CE1# / CE2# and WE# must be a logical
Figure 3. Secured Silicon Sector Protect Verify
CC
power-up and power-down. The command register and all
S71PL129JC0/S71PL129JB0/S71PL129JA0
Write 40h to SecSi
LKO
Read from SecSi
Sector address
Sector address
A1 = 1, A0 = 0
A1 = 1, A0 = 0
Write 60h to
with A6 = 0,
any address
with A6 = 0,
RESET# =
, the device does not accept any write cycles. This pro-
V
Wait 1 μs
LKO
START
I n f o r m a t i o n
IH
or V
.
ID
Remove V
SecSi Sector is
SecSi Sector is
If data = 00h,
If data = 01h,
from RESET#
Protect Verify
SecSi Sector
CC
IL
unprotected.
Write reset
protected.
command
complete
and OE# = V
is greater than V
IH
or V
ID
IL
, CE1# = CE2# = V
IH
during power up,
LKO
. The system
CC
IH
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