參數(shù)資料
型號: S71PL129JC0BFI9P3
廠商: Spansion Inc.
英文描述: Stacked Multi-Chip Product (MCP) Flash Memory
中文描述: 堆疊式多芯片產(chǎn)品(MCP)的快閃記憶體
文件頁數(shù): 41/149頁
文件大?。?/td> 2693K
代理商: S71PL129JC0BFI9P3
June 4, 2004 S29PL129J_MCP_00_A0
S29PL129J for MCP
41
A d v a n c e I n f o r m a t i o n
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
CC
power-up and power-down transitions, or from system noise.
Low V
CC
W rite I nhibit
When V
CC
is less than V
LKO
, the device does not accept any write cycles. This pro-
tects data during V
CC
power-up and power-down. The command register and all
internal program/erase circuits are disabled, and the device resets to the read
mode. Subsequent writes are ignored until V
CC
is greater than V
LKO
. The system
must provide the proper signals to the control pins to prevent unintentional writes
when V
CC
is greater than V
LKO
.
W rite 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 I nhibit
Write cycles are inhibited by holding any one of OE# = V
IL
, CE1# = CE2# = V
IH
or WE# = V
IH
. To initiate a write cycle, CE1# / CE2# and WE# must be a logical
zero while OE# is a logical one.
Pow er-Up W rite I nhibit
If WE# = CE# (CE1#, CE2# in PL129J) = V
IL
and OE# = V
IH
during power up,
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.
Figure 3. Secured Silicon Sector Protect Verify
Write 60h to
any address
Write 40h to SecSi
Sector address
with A6 = 0,
A1 = 1, A0 = 0
START
RESET# =
V
IH
or V
ID
Wait 1
μ
s
Read from SecSi
Sector address
with A6 = 0,
A1 = 1, A0 = 0
If data = 00h,
SecSi Sector is
unprotected.
If data = 01h,
SecSi Sector is
protected.
Remove V
or V
ID
from RESET#
Write reset
command
SecSi Sector
Protect Verify
complete
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