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參數(shù)資料
| 型號： | AM29DS323DB50EI |
| 廠商： | Advanced Micro Devices, Inc. |
| 英文描述： | 32 Megabit (4 M x 8-Bit/2 M x 16-Bit) CMOS 1.8 Volt-only, Simultaneous Operation Flash Memory |
| 中文描述： | 32兆位（4個M × 8位/ 2米x 16位），1.8伏的CMOS只，同時作業(yè)快閃記憶體 |
| 文件頁數(shù)： | 22/56頁 |
| 文件大?。?/td> | 641K |
| 代理商： | AM29DS323DB50EI |
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20
Am29DS323D
23480A5 October10,2006
D A T A S H E E T
Secured Silicon Sector Flash
Memory Region
The Secured Silicon Sector feature provides a Flash
memory region that enables permanent part identifica-
tion through an Electronic Serial Number (ESN). The
Secured Silicon Sector is 64 Kbytes in length, and
uses a Secured Silicon Sector Indicator Bit to indicate
whether or not the Secured Silicon Sector is locked
when shipped from the factory. This bit is permanently
set at the factory and cannot be changed, which pre-
vents 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 Secured Silicon Sector
either factory locked or customer lockable. The fac-
tory-locked version is always protected when shipped
from the factory, and has the Secured Silicon Sector
Indicator Bit permanently set to a “1.” The cus-
tomer-lockable version is shipped with the
unprotected, allowing customers to utilize the that sec-
tor in any manner they choose. The customer-lockable
version has the Secured Silicon Sector Indicator Bit
permanently set to a “0.” Thus, the Secured Silicon
Sector Indicator Bit prevents customer-lockable de-
vices from being used to replace devices that are
factory locked.
The system accesses the Secured Silicon Sector
through a command sequence (see
“Enter Secured
Silicon Sector/Exit Secured Silicon Sector
Command Sequence”
). After the system has written
the Enter Secured Silicon Sector command sequence,
it may read the Secured Silicon Sector by using the
addresses normally occupied by the boot sectors. This
mode of operation continues until the system issues
the Exit Secured Silicon Sector command sequence,
or until power is removed from the device. On
power-up, or following a hardware reset, the device re-
verts to sending commands to the boot sectors
instead of the Secured Silicon sector.
Factory Locked: Secured Silicon Sector
Programmed and Protected at the Factory
In a factory locked device, the Secured Silicon Sector
is protected when the device is shipped from the fac-
tory. The Secured Silicon Sector cannot be modified in
any way. The device is available preprogrammed with
one of the following:
■
A random, secure ESN only
■
Customer code through the ExpressFlash service
■
Both a random, secure ESN and customer code
through the ExpressFlash service.
In devices that have an ESN, a Bottom Boot device will
have
the
16-byte
ESN
at
addresses
000000h–000007h
000000h–00000Fh in byte mode). In the Top Boot de-
vice the starting address of the ESN will be at ad-
dresses 1F83C0h–1F83C7h in word mode (or
addresses 3F0780h–3F078Fh in byte mode).
in
word
mode
(or
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 permanently locked. Contact an AMD
representative for details on using AMD’s Express-
Flash service.
Customer Lockable: Secured Silicon Sector NOT
Programmed or Protected at the Factory
If the security feature is not required, the Secured Sili-
con Sector can be treated as an additional Flash
memory space, expanding the size of the available
Flash array by 64 Kbytes. The Secured Silicon Sector
can be read, programmed, and erased as often as re-
quired. The Secured Silicon Sector area can be
protected using one of the following procedures:
■
Write the three-cycle Enter Secured Silicon Sector
Region command sequence, and then follow the
in-system sector protect algorithm as shown in Fig-
ure 2, except that
RESET# may be at either V
IH
or
V
ID
. This allows in-system protection of the without
raising any device pin to a high voltage. Note that
this method is only applicable to the Secured Silicon
Sector.
■
Write the three-cycle Enter Secured Silicon Sector
Region command sequence, and then use the alter-
nate method of sector protection described in the
“Sector/Sector Block Protection and Unprotection”
.
Once the Secured Silicon Sector is locked and veri-
fied, the system must write the Exit Secured Silicon
Sector Region command sequence to return to read-
ing and writing the remainder of the array.
The Secured Silicon Sector protection must be used
with caution since, once protected, there is no proce-
dure available for unprotecting the Secured Silicon
Sector area and none of the bits in the Secured Silicon
Sector memory space can be modified in any way.
Hardware Data Protection
The command sequence requirement of unlock cycles
for programming or erasing provides data protection
against inadvertent writes (refer to
Table 14
for com-
mand definitions). 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.
相關(guān)PDF資料 |
PDF描述 |
|---|---|
| AM29DS323DB50EIN | 32 Megabit (4 M x 8-Bit/2 M x 16-Bit) CMOS 1.8 Volt-only, Simultaneous Operation Flash Memory |
| AM29DS323DB50WMI | 32 Megabit (4 M x 8-Bit/2 M x 16-Bit) CMOS 1.8 Volt-only, Simultaneous Operation Flash Memory |
| AM29DS323DB50WMIN | 32 Megabit (4 M x 8-Bit/2 M x 16-Bit) CMOS 1.8 Volt-only, Simultaneous Operation Flash Memory |
| AM29DS323DT50EI | 32 Megabit (4 M x 8-Bit/2 M x 16-Bit) CMOS 1.8 Volt-only, Simultaneous Operation Flash Memory |
| AM29DS323DT50EIN | 32 Megabit (4 M x 8-Bit/2 M x 16-Bit) CMOS 1.8 Volt-only, Simultaneous Operation Flash Memory |
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| AM29DS323DT11WMINS | 制造商:Advanced Micro Devices 功能描述: |
| AM29F002B-70JC | 制造商:Advanced Micro Devices 功能描述:NOR Flash, 256K x 8, 32 Pin, Plastic, PLCC |
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