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參數(shù)資料
| 型號： | Am29PDL128G80 |
| 廠商： | Spansion Inc. |
| 英文描述： | 128 Megabit (8 M x 16-Bit/4 M x 32-Bit) CMOS 3.0 Volt-only, Simultaneous Read/ Write Flash Memory with VersatileIO Control |
| 中文描述： | 128兆位（8米× 16位/ 4米× 32位），3.0伏的CMOS只，同步讀/寫閃存與VersatileIO控制記憶 |
| 文件頁數(shù)： | 29/69頁 |
| 文件大?。?/td> | 1181K |
| 代理商： | AM29PDL128G80 |
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28
Am29PDL128G
July 29, 2002
P R E L I M I N A R Y
Temporary Sector Unprotect
This feature allows temporary unprotection of previ-
ously protected sectors to change data in-system. The
Sector Unprotect mode is activated by setting the RE-
SET# pin to
V
ID
. During this mode, formerly protected
sectors can be programmed or erased by selecting the
sector addresses. Once V
ID
is removed from the RE-
SET# pin, all the previously protected sectors are
protected again. Figure 2 shows the algorithm, and
Figure 23 shows the timing diagrams, for this feature.
Figure 2.
Temporary Sector Unprotect Operation
SecSi
(Secured Silicon) Sector
Flash Memory Region
The SecSi (Secured Silicon) Sector feature provides a
Flash memory region that enables permanent part
identification through an Electronic Serial Number
(ESN). The SecSi Sector is 128 words (64 double
words) in length, and uses a SecSi Sector Indicator Bit
(DQ7) to indicate whether or not the SecSi Sector is
locked when shipped from the factory. This bit is per-
manently set at the factory and cannot be changed,
which prevents cloning of a factory locked part. This
ensures the security of the ESN once the product is
shipped to the field.
AMD offers the device with the SecSi Sector either
factory locked or customer lockable. The fac-
tory-locked version is always protected when shipped
from the factory, and has the SecSi Sector Indicator
Bit permanently set to a
“
1.
”
The customer-lockable
version is shipped with the SecSi Sector unprotected,
allowing customers to utilize the that sector in any
manner they choose. The customer-lockable version
has the SecSi Sector Indicator Bit permanently set to a
“
0.
”
Thus, the SecSi Sector Indicator Bit prevents cus-
tomer-lockable devices from being used to replace de-
vices that are factory locked.
The system accesses the SecSi Sector through a
command sequence (see
Enter SecSi Sector/Exit
SecSi Sector Command Sequence
). After the system
has written the Enter SecSi Sector command se-
quence, it may read the SecSi Sector by using the ad-
dresses normally occupied by the boot sectors. This
mode of operation continues until the system issues
the Exit SecSi Sector command sequence, or until
power is removed from the device. On power-up, or
following a hardware reset, the device reverts to send-
ing commands to the normal address space.
Factory Locked: SecSi Sector Programmed and
Protected At the Factory
In a factory locked device, the SecSi Sector is pro-
tected when the device is shipped from the factory.
The SecSi Sector cannot be modified in any way. The
device is preprogrammed with both a random number
and a secure ESN. The SecSi Sector is located at ad-
dresses 000000h
–
00007Fh in word mode (or
000000h
–
00003Fh in double word mode). The device
is available preprogrammed with one of the following:
I
A random, secure ESN only
I
Customer code through the ExpressFlash service
I
Both a random, secure ESN and customer code
through the ExpressFlash service.
Customers may opt to have their code programmed by
AMD through the AMD ExpressFlash service. AMD
programs the customer
’
s code, with or without the ran-
dom ESN. The devices are then shipped from AMD
’
s
factory with the SecSi Sector permanently locked.
Contact an AMD representative for details on using
AMD
’
s ExpressFlash service.
Customer Lockable: SecSi Sector NOT
Programmed or Protected At the Factory
If the security feature is not required, the SecSi Sector
can be treated as an additional Flash memory space.
The SecSi Sector can be read any number of times,
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.
START
Perform Erase or
Program Operations
RESET# = V
IH
Temporary Sector
Unprotect Completed
(Note 2)
RESET# = V
ID
(Note 1)
Notes:
1. All protected sectors unprotected (If WP# = V
IL
, sectors
0, 1, 268, and 269 will remain protected).
2. All previously protected sectors are protected once
again.
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