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參數(shù)資料
| 型號： | AM29LV640MU110PCI |
| 廠商： | Advanced Micro Devices, Inc. |
| 元件分類： | FLASH |
| 英文描述： | 64 Megabit (4 M x 16-Bit) MirrorBita?? 3.0 Volt-only Uniform Sector Flash Memory with VersatileI/Oa?? Control |
| 中文描述： | 64Mb(4個M x 16位)的MirrorBit，3V，統(tǒng)一扇區(qū)閃存并有Versatile輸入/輸出控制 |
| 文件頁數(shù)： | 21/59頁 |
| 文件大?。?/td> | 699K |
| 代理商： | AM29LV640MU110PCI |
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February1,2007 25301C5
Am29LV640MU
19
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 128 words in length, and
uses a Secured Silicon Sector Indicator Bit (DQ7) to
indicate whether or not the Secured Silicon 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 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 Secured
Silicon Sector unprotected, allowing customers to pro-
gram the sector after receiving the device. The cus-
tomer-lockable version also has the Secured Silicon
Sector Indicator Bit permanently set to a “0.” Thus, the
Secured Silicon Sector Indicator Bit prevents cus-
tomer-lockable devices from being used to replace de-
vices that are factory locked.
The Secured Silicon sector address space in this de-
vice is allocated as follows:
Table 5.
Secured Silicon Sector Contents
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 first sector (SA0).
This mode of operation continues until the system is-
sues the Exit Secured Silicon Sector command se-
quence, or until power is removed from the device. On
power-up, or following a hardware reset, the device re-
verts to sending commands to sector SA0.
Factory Locked: Secured Silicon Sector
Programmed and Protected At the Factory
In devices with an ESN, the Secured Silicon Sector is
protected when the device is shipped from the factory.
The Secured Silicon Sector cannot be modified in any
way. See
Table 5
for Secured Silicon Sector address-
ing.
Customers may opt to have their code programmed by
AMD through the AMD ExpressFlash service. The de-
vices are then shipped from AMD’s factory with the
Secured Silicon Sector permanently locked. Contact
an AMD representative for details on using AMD’s Ex-
pressFlash service.
Customer Lockable: Secured Silicon Sector NOT
Programmed or Protected At the Factory
As an alternative to the factory-locked version, the de-
vice may be ordered such that the customer may pro-
gram and protect the 128-word Secured Silicon sector.
The system may program the Secured Silicon Sector
using the write-buffer, accelerated and/or unlock by-
pass methods, in addition to the standard program-
ming command sequence. See
Command Definitions
.
Programming and protecting the Secured Silicon Sec-
tor must be used with caution since, once protected,
there is no procedure available for unprotecting the
Secured Silicon Sector area and none of the bits in the
Secured Silicon Sector memory space can be modi-
fied in any way.
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 Secured
Silicon Sector without raising any device pin to a
high voltage. Note that this method is only applica-
ble to the Secured Silicon Sector.
■
To verify the protect/unprotect status of the Secured
Silicon Sector, follow the algorithm shown in
Figure
3
.
Once the Secured Silicon Sector is programmed,
locked and verified, the system must write the Exit Se-
cured Silicon Sector Region command sequence to
return to reading and writing within the remainder of
the array.
Secured Silicon
Sector Address
Range
Standard
Factory Locked
ExpressFlash
Factory Locked
ESN or
determined by
customer
Determined by
customer
Customer
Lockable
000000h–000007h
ESN
Determined by
customer
000008h–00007Fh
Unavailable
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