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AM29DL322GB90EI 参数 Datasheet PDF下载

AM29DL322GB90EI图片预览
型号: AM29DL322GB90EI
PDF下载: 下载PDF文件 查看货源
内容描述: 32兆位( 4米×8位/ 2的M× 16位) CMOS 3.0伏只,同时操作闪存 [32 Megabit (4 M x 8-Bit/2 M x 16-Bit) CMOS 3.0 Volt-only, Simultaneous Operation Flash Memory]
分类和应用: 闪存
文件页数/大小: 58 页 / 1293 K
品牌: SPANSION [ SPANSION ]
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D A T A S H E E T  
vice the ESN will be at addresses  
Secured Silicon Sector  
Flash Memory Region  
1FF000h–1FF007Fh in word mode (or addresses  
3FE000h–3FE0FFh in byte mode).  
The Secured Silicon Sector feature provides a  
256-byte Flash memory region that enables perma-  
nent part identification through an Electronic Serial  
Number (ESN). The Secured Silicon Sector 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 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.  
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 Secured Silicon Sector permanently  
locked. Contact an AMD representative for details on  
using AMD’s ExpressFlash 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 256-byte  
Flash memory space, expanding the size of the avail-  
able Flash array. Additionally, note the difference in  
the location of the ESN compared to previous  
Am29DL32x top boot factory locked devices. The  
Secured Silicon Sector is one-time programmable,  
may not be erased, and can be locked only once. Note  
that the accelerated programming (ACC) and unlock  
bypass functions are not available when programming  
the Secured Silicon Sector.  
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 uti-  
lize the that sector 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 cus-  
tomer-lockable devices from being used to replace de-  
vices that are factory locked.  
The Secured Silicon Sector area can be protected  
using one of the following procedures:  
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 ad-  
dresses 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.  
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 VIH or  
VID. 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.  
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”  
section.  
Factory Locked: Secured Silicon Sector  
Programmed and Protected At the Factory  
The Secured Silicon Sector is one-time programma-  
ble. Once the Secured Silicon Sector is locked and  
verified, the system must write the Exit Secured Sili-  
con Sector Region command sequence to return to  
reading and writing the remainder of the array.  
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:  
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.  
A random, secure ESN only  
Customer code through the ExpressFlash service  
Both a random, secure ESN and customer code  
through the ExpressFlash service.  
Hardware Data Protection  
In devices that have an ESN, a Bottom Boot device will  
have the 16-byte ESN at addresses  
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  
000000h–000007h  
in  
word  
mode  
(or  
000000h–00000Fh in byte mode). In the Top Boot de-  
December 4, 2006 25686B10  
Am29DL32xG  
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