參數(shù)資料
型號(hào)： L640DU90RI
廠商： Advanced Micro Devices, Inc.
英文描述： 64 Megabit (4 M x 16-Bit) CMOS 3.0 Volt-only Uniform Sector Flash Memory with VersatileIO⑩ Control
中文描述： 64兆位（4個(gè)M x 16位），3.0伏的CMOS只均勻部門閃存與VersatileIO⑩控制記憶
文件頁數(shù)： 22/57頁
文件大?。?/td> 885K
代理商： L640DU90RI
20
Am29LV640D/Am29LV641D
22366C6 January22,2007
D A T A S H E E T
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 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 permanently set at
the factory and cannot be changed, which prevents
cloning of a factory locked part. This ensures the secu-
rity 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 (Secured Silicon)
Sector Indicator Bit permanently set to a “1.” The cus-
tomer-lockable version is shipped with the SecSi Sec-
tor unprotected, allowing customers to utilize that
sector in any manner they choose. The customer-lock-
able version also has the SecSi Sector Indicator Bit
permanently set to a “0.” Thus, the SecSi Sector Indi-
cator Bit prevents customer-lockable devices from
being used to replace devices that are factory locked.
The SecSi sector address space in this device is allo-
cated as shown in
Table 5
:
Table 5.
SecSi Sector Contents
The system accesses the SecSi Sector through a
command sequence (see
“Enter SecSi Sector/Exit
SecSi Sector Command Sequence” on page 24
). After
the system writes the Enter SecSi Sector command
sequence, it may read the SecSi Sector by using the
addresses normally occupied by the first sector (SA0).
This mode of operation continues until the system is-
sues 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
sending commands to sector SA0.
Factory Locked: SecSi Sector Programmed and
Protected At the Factory
In devices with an ESN, the SecSi Sector is protected
when the device is shipped from the factory. The SecSi
Sector cannot be modified in any way. A factory locked
device has an 8-word random ESN at addresses
000000h–000007h.
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
SecSi Sector permanently locked. Contact an AMD
representative for details on using AMD’s Express-
Flash service.
Customer Lockable: SecSi Sector NOT
Programmed or Protected At the Factory
As an alternative to the factory-locked version, the de-
vice can be ordered such that the customer may pro-
gram and protect the 128-word SecSi sector.
Programming and protecting the SecSi Sector must be
used with caution since, once protected, there is no
procedure available for unprotecting the SecSi Sector
area and none of the bits in the SecSi Sector memory
space can be modified in any way.
You can protect the SecSi Sector area 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 2, on
page 19
, except that
RESET# may be at either V
IH
or V
ID
. This allows in-system protection of the SecSi
Sector without raising any device pin to a high volt-
age. Note that this method is only applicable to the
SecSi Sector.
■
Write the three-cycle Enter SecSi Sector Region
command sequence, then use the alternate method
of sector protection described in the
“Sector Group
Protection and Unprotection” on page 17
.
Once the SecSi Sector is programmed, locked, and
verified, the system must write the Exit SecSi Sector
Region command sequence to return to reading and
writing within the remainder of the array.
Hardware Data Protection
The command sequence requirement of unlock cycles
for programming or erasing provides data protection
against inadvertent writes (refer to
Table 10 on
page 28
for command definitions). In addition, the fol-
lowing hardware data protection measures prevent ac-
cidental 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
.
SecSi 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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