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24AA02E48/24AA025E48
9.0
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 9-2. The first 3 bytes are the Organizationally
The 24AAXXXE48 is programmed at the factory with a
globally unique, EUI-48? and EUI-64? compatible
node address stored in the upper half of the array and
permanently write-protected. The remaining 1,024 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 9-1:
MEMORY ORGANIZATION
9.1
EUI-64? Support
Standard
EEPROM
Write-Protected
EUI-48? Block
00h
80h
FFh
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.
FIGURE 9-2:
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
? 2010 Microchip Technology Inc.
DS22124D-page 13
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