Datasheet
24AA02E48/24AA025E48/24AA02E64/24AA025E64
DS20002124E-page 14 2008-2013 Microchip Technology Inc.
9.2 EUI-64™ Node Address
(24AAXXXE64)
The 8-byte EUI-64™ node address value of the
24AAXXXE64 is stored in array locations 0xF8 through
0xFF, as shown in Figure 9-3. The first three bytes are
the Organizationally Unique Identifier (OUI) assigned
to Microchip by the IEEE Registration Authority. Cur-
rently, Microchip’s OUIs are 0x0004A3 and 0x001EC0,
though this will change as addresses are exhausted.
The remaining five bytes are the Extension Identifier,
and are generated by Microchip to ensure a globally
unique, 64-bit value.
FIGURE 9-3: EUI-64 NODE ADDRESS PHYSICAL MEMORY MAP EXAMPLE (24AAXXXE64)
Note: In conformance with IEEE guidelines,
Microchip will not use the values 0xFFFE
and 0xFFFF for the first two bytes of the
EUI-64 Extension Identifier. These two
values are specifically reserved to allow
applications to encapsulate EUI-48
addresses into EUI-64 addresses.
F8h FFh
24-bit Organizationally
Unique Identifier
40-bit Extension
Identifier
00h 04h A3h 12h 34h 56h
Corresponding EUI-64™ Node Address:
00-04-A3-12-34-56-78-90
Description
Data
Array
Address
78h 90h