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參數(shù)資料
| 型號： | AM29PDL310G98WSIN |
| 廠商： | Spansion Inc. |
| 英文描述： | 64 Megabit (4 M x 16-Bit) CMOS 3.0 Volt-only, Simultaneous Read/Write Flash Memory with Enhanced VersatileIO Control |
| 中文描述： | 64兆位（4個M x 16位），3.0伏的CMOS只，同步讀/寫閃存與增強VersatileIO控制記憶 |
| 文件頁數(shù)： | 24/61頁 |
| 文件大?。?/td> | 1653K |
| 代理商： | AM29PDL310G98WSIN |
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February 26, 2003
Am29PDL640G
23
P R E L I M I N A R Y
but can be programmed and locked only once. Note
that the accelerated programming (ACC) and unlock
bypass functions are not available when programming
the SecSi Sector.
The SecSi Sector area can be protected using one of
the following procedures:
■
Write the three-cycle Enter SecSi Sector Region
command sequence, and then follow the in-system
sector protect algorithm as shown in
Figure Note:
,
except that
RESET# may be at either V
IH
or V
ID
.
This allows in-system protection of the SecSi Sector
Region without raising any device pin to a high volt-
age. Note that this method is only applicable to the
SecSi Sector.
■
To verify the protect/unprotect status of the SecSi
Sector, follow the algorithm shown in Figure 3.
Once the SecSi Sector is locked and verified, the sys-
tem must write the Exit SecSi Sector Region com-
mand sequence to return to reading and writing the
remainder of the array.
The SecSi Sector lock must be used with caution
since, once locked, there is no procedure available for
unlocking the SecSi Sector area and none of the bits
in the SecSi Sector memory space can be modified in
any way.
SecSi Sector Protection Bit
The SecSi Sector Protection Bit prevents program-
ming of the SecSi Sector memory area. Once set, the
SecSi Sector memory area contents are non-modifi-
able.
Figure 3.
SecSi Sector Protect Verify
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
Write Inhibit
When V
CC
is less than V
LKO
, the device does not ac-
cept any write cycles. This protects 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
.
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
IL
, CE# = V
IH
or WE# = V
IH
. To initiate a write cycle,
CE# and WE# must be a logical zero while OE# is a
logical one.
Power-Up Write Inhibit
If WE# = CE# = 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 automati-
cally reset to the read mode on power-up.
COMMON FLASH MEMORY INTERFACE
(CFI)
The Common Flash Interface (CFI) specification out-
lines device and host system software interrogation
handshake, which allows specific vendor-specified
software algorithms to be used for entire families of
devices. Software support can then be device-inde-
pendent, JEDEC ID-independent, and forward- and
backward-compatible for the specified flash device
families. Flash vendors can standardize their existing
interfaces for long-term compatibility.
This device enters the CFI Query mode when the sys-
tem writes the CFI Query command, 98h, to address
55h, any time the device is ready to read array data.
The system can read CFI information at the addresses
given in Tables
10
–
13
. To terminate reading CFI data,
the system must write the reset command. The CFI
Query mode is not accessible when the device is exe-
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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