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AM29LV640MH112RPCI 参数 Datasheet PDF下载

AM29LV640MH112RPCI图片预览
型号: AM29LV640MH112RPCI
PDF下载: 下载PDF文件 查看货源
内容描述: 64兆位(4M ×16位/ 8的M× 8位)的MirrorBit 3.0伏特,只有统一部门快闪记忆体与VersatileI / O控制 [64 Megabit (4 M x 16-Bit/8 M x 8-Bit) MirrorBit 3.0 Volt-only Uniform Sector Flash Memory with VersatileI/O Control]
分类和应用: 闪存内存集成电路
文件页数/大小: 62 页 / 1108 K
品牌: SPANSION [ SPANSION ]
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D A T A S H E E T  
AMD offers the device with the SecSi Sector either  
SecSi (Secured Silicon) Sector Flash  
Memory Region  
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 program the  
sector after receiving the device. 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 (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/256 bytes 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 pre-  
vents cloning of a factory locked part. This ensures the  
security of the ESN once the product is shipped to the  
field.  
The SecSi sector address space in this device is allo-  
cated as follows:  
SecSi Sector Address Range  
Standard Factory  
Locked  
ExpressFlash  
Factory Locked  
x16  
x8  
Customer Lockable  
000000h–  
000007h  
000000h–  
00000Fh  
ESN or determined  
by customer  
ESN  
Determined by customer  
000008h–  
00007Fh  
000010h–  
0000FFh  
Determined  
by customer  
Unavailable  
The system accesses the SecSi Sector through a  
command sequence (see “Enter SecSi Sector/Exit  
SecSi Sector Command Sequence”). After the system  
has written the Enter SecSi Sector command se-  
quence, it may read the SecSi Sector by using the ad-  
dresses 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.  
gram and protect the 128-word/256 bytes SecSi  
sector. See Table 5 for SecSi Sector addressing.  
The system may program the SecSi Sector using the  
write-buffer, accelerated and/or unlock bypass meth-  
ods, in addition to the standard programming com-  
mand sequence. See Command Definitions.  
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.  
Factory Locked: SecSi Sector Programmed and  
Protected At the Factory  
The SecSi Sector area can be protected using one of  
the following procedures:  
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. See Table 5 for  
SecSi Sector addressing.  
Write the three-cycle Enter SecSi Sector Region  
command sequence, and then follow the in-system  
sector protect algorithm as shown in Figure 2, ex-  
cept that RESET# may be at either VIH or VID. This  
allows 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.  
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.  
To verify the protect/unprotect status of the SecSi  
Sector, follow the algorithm shown in Figure 3.  
Customer Lockable: SecSi Sector NOT  
Programmed or Protected At the Factory  
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.  
As an alternative to the factory-locked version, the de-  
vice may be ordered such that the customer may pro-  
20  
Am29LV640MH/L  
December 14, 2005