參數(shù)資料
型號： AM29LV320DB120WME
廠商： SPANSION LLC
元件分類： PROM
英文描述： 2M X 16 FLASH 3V PROM, 120 ns, PBGA48
封裝： 6 X 12 MM, 0.80 MM PITCH, FBGA-48
文件頁數(shù)： 13/53頁
文件大?。?/td> 1008K
代理商： AM29LV320DB120WME
20
Am29LV320D
July 30, 2002
SecSi
TM Sector (Security on Silicon) Flash
Memory Region
The Security on Silicon Sector (SecSi Sector) feature
provides a Flash memory region that enables perma-
nent part identification through an Electronic Serial
Number (ESN). The SecSi Sector 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 security of the ESN once
the product is shipped to the field. Current version of
device has 64 Kbytes; future versions will have
only 256 bytes. This should be considered during
system design.
AMD offers the device with the SecSi Sector either
f act ory l ocke d o r cu st om e r l ocka ble . T he f ac-
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
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 boot sectors.
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 available preprogrammed with one of the fol-
lowing:
■ 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 (8-word) ESN in sector 0 at ad-
dr es s e s 00000h–0000F h in by t e m ode ( o r
00000h–00007h in word mode). In the Top Boot de-
vice the ESN will be in sector 63 at addresses
3F 0000h–3F 000F h
in
by t e
m o d e
( o r
1F8000h–1F8007h in word mode). Note that in up-
coming top boot versions of this device, the ESN will
be
l o c a t ed
in
s e c t or
70
at
addr es s e s
3F E 000h–3F E 00F h
in
by t e
m ode
( o r
1FF000h–1FF007h in word mode).
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
The customer lockable version allows the SecSi Sec-
tor to be programmed once and then permanently
locked after it has shipped from AMD. Current ver-
sion of device has 64 Kbytes; future versions will
have only 256 bytes. This should be considered
during system design. Additionally, note the
change in the location of the ESN in upcoming top
boot factory locked devices. Note that the acceler-
ated 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 Region command
sequence, and then follow the in-system sector pro-
tect algorithm as shown in Figure 2, except that RE-
SET# may be at either V
IH or VID . This a llows
in-system protection of the SecSi Sector without
raising any device pin to a high voltage. 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.
■ Write the three-cycle Enter SecSi Region command
sequence, and then use the alternate method of
sector protection described in the “Sector/Sector
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 protection must be used with cau-
tion since, once protected, there is no procedure avail-
able for unprotecting the SecSi Sector area and none
of the bits in the SecSi Sector memory space can be
modified in any way.
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相關(guān)代理商/技術(shù)參數(shù)
參數(shù)描述
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AM29LV320DB90ED 制造商:Spansion 功能描述:Flash Mem Parallel 3V/3.3V 32M-Bit 4M x 8/2M x 16 90ns 48-Pin TSOP
AM29LV320DB90EF 制造商:Spansion 功能描述:Flash Mem Parallel 3V/3.3V 32M-Bit 4M x 8/2M x 16 90ns 48-Pin TSOP
AM29LV320DB90EI 制造商:Spansion 功能描述:Flash Mem Parallel 3V/3.3V 32M-Bit 4M x 8/2M x 16 90ns 48-Pin TSOP
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