S71PL032J SPANSION [SPANSION], S71PL032J Datasheet - Page 62

• Manufacturer Part Number: S71PL032J
• Description: STACKED MULTI CHIP PRODUCT FLASH MEMORY AND RAM
• Manufacturer: SPANSION [SPANSION]

62
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#, CE#, or WE# do not initiate a
write cycle.
Logical Inhibit
Write cycles are inhibited by holding any one of OE# = V
V
logical one.
Power-Up Write Inhibit
If WE# = CE# = V
commands on the rising edge of WE#. The internal state machine is automatically
reset to the read mode on power-up.
IH
. To initiate a write cycle, CE# and WE# must be a logical zero while OE# is a
CC
CC
CC
Write Inhibit
is less than V
is greater than V
Figure 3. Secured Silicon Sector Protect Verify
IL
CC
and OE# = V
S29PL127J/S29PL064J/S29PL032J for MCP
power-up and power-down. The command register and all
Write 40h to SecSi
LKO
Read from SecSi
Sector address
Sector address
A1 = 1, A0 = 0
A1 = 1, A0 = 0
Write 60h to
any address
with A6 = 0,
with A6 = 0,
RESET# =
, the device does not accept any write cycles. This pro-
V
Wait 1 µs
LKO
START
A d v a n c e
IH
or V
.
ID
IH
during power up, the device does not accept
Remove V
SecSi Sector is
SecSi Sector is
If data = 00h,
If data = 01h,
from RESET#
Protect Verify
SecSi Sector
CC
unprotected.
I n f o r m a t i o n
Write reset
protected.
command
complete
is greater than V
IH
or V
ID
IL
, CE# = V
S29PL127J_064J_032J_MCP_00_A3 August 12, 2004
LKO
. The system
IH
or WE# =
CC