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25AA02E48
3.0
PRE-PROGRAMMED EUI-48?
NODE ADDRESS
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
The 25AA02E48 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.
Unique Identifier (OUI) assigned to Microchip by the
IEEE Registration Authority. Microchip’s OUI is
0x0004A3. The remaining 3 bytes are the Extension
Identifier, and are generated by Microchip to ensure a
globally-unique, 48-bit value.
FIGURE 3-1:
MEMORY ORGANIZATION
3.1
EUI-64? Support
Standard
EEPROM
00h
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
Write-Protected
EUI-48? Block
C0h
FFh
shown below.
FIGURE 3-2:
EUI-48 NODE ADDRESS PHYSICAL MEMORY MAP EXAMPLE
Description
24-bit Organizationally
Unique Identifier
24-bit Extension
Identifier
Data
00h
04h
A3h
12h
34h
56h
Array
Address
FAh
FFh
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
X
—
6
X
—
5
X
—
4
X
—
3
BP1
0
2
BP0
1
1
WEL
—
0
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.
? 2010 Microchip Technology Inc.
DS22123B-page 13
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