24AA02E48_16 Datasheet, PDF (15/32 Pages) Microchip Technology – 2K I2C Serial EEPROMs with EUI-48�� Node Identity

24AA02E48/24AA025E48/24AA02E64/24AA025E64
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.
Note:
Currently, Microchip’s OUIs are
0x0004A3, 0X001EC0, 0xD88039 and
0x5410EC, 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.
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.
FIGURE 9-3:
EUI-64 NODE ADDRESS PHYSICAL MEMORY MAP EXAMPLE (24AAXXXE64)
Description
24-bit Organizationally
Unique Identifier
40-bit Extension
Identifier
Data
00h
04h
A3h
12h
34h
56h
78h
90h
Array
Address
F8h
FFh
Corresponding EUI-64™ Node Address: 00-04-A3-12-34-56-78-90
 2008-2016 Microchip Technology Inc.
DS20002124G-page 15