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11AA02E48-I/TT 参数 Datasheet PDF下载

11AA02E48-I/TT图片预览
型号: 11AA02E48-I/TT
PDF下载: 下载PDF文件 查看货源
内容描述: 2K UNI / O®串行EEPROM与EUI- 48 ™节点标识 [2K UNI/O® Serial EEPROM with EUI-48™ Node Identity]
分类和应用: 可编程只读存储器电动程控只读存储器电可擦编程只读存储器
文件页数/大小: 18 页 / 259 K
品牌: MICROCHIP [ MICROCHIP ]
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11AA02E48  
The 6-byte EUI-48™ node address value is stored in  
array locations 0xFA through 0xFF, as shown in  
Figure 3-2. The first 3 bytes are the Organizationally  
Unique Identifier (OUI) assigned to Microchip by the  
IEEE Registration Authority. The remaining 3 bytes are  
the Extension Identifier, and are generated by Micro-  
chip to ensure a globally-unique, 48-bit value.  
3.0  
PRE-PROGRAMMED EUI-48™  
NODE ADDRESS  
The 11AA02E48 is programmed at the factory with a  
globally unique, EUI-48™ and EUI-64™ compatible  
node address stored in the upper 1/4 of the array and  
write-protected through the STATUS register. The  
remaining 1,536 bits are available for application use.  
3.1  
EUI-64™ Support  
FIGURE 3-1:  
MEMORY ORGANIZATION  
The pre-programmed EUI-48 node address can easily  
be encapsulated at the application level to form a glob-  
ally unique, 64-bit node address for systems utilizing  
the EUI-64 standard. This is done by adding 0xFFFE  
between the OUI and the Extension Identifier, as  
shown below.  
00h  
Standard  
EEPROM  
C0h  
Write-Protected  
EUI-48™ Block  
FFh  
FIGURE 3-2:  
EUI-48 NODE ADDRESS PHYSICAL MEMORY MAP EXAMPLE  
24-bit Organizationally  
Unique Identifier  
24-bit Extension  
Identifier  
Description  
00h  
04h  
A3h  
12h  
34h  
56h  
FFh  
Data  
Array  
Address  
FAh  
Corresponding EUI-48™ Node Address: 00-04-A3-12-34-56  
Corresponding EUI-64™ Node Address: 00-04-A3-FF-FE-12-34-56  
3.2  
Factory-Programmed Write  
Protection  
In order to help guard against accidental corruption of  
the EUI-48 node address, the BP1 and BP0 bits of the  
STATUS register are programmed at the factory to ‘0’  
and ‘1’, respectively, as shown in the following table:  
7
6
5
4
3
BP1  
0
2
BP0  
1
1
0
X
X
X
X
WEL  
WIP  
This protects the upper 1/4 of the array (0xC0 to 0xFF)  
from write operations. This array block can be utilized  
for writing by clearing the BP bits with a Write Status  
Register (WRSR) instruction. Note that if this is per-  
formed, care must be taken to prevent overwriting the  
EUI-48 value.  
DS22122A-page 6  
Preliminary  
© 2008 Microchip Technology Inc.