24AA02E48_16 Datasheet, PDF(14/32 Page) Microchip Technology – 2K I2C Serial EEPROMs with EUI-48�� Node Identity

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24AA02E48_16 Datasheet, PDF (14/32 Pages) Microchip Technology – 2K I2C Serial EEPROMs with EUI-48�� Node Identity

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24AA02E48/24AA025E48/24AA02E64/24AA025E64

9.0 PRE-PROGRAMMED EUI-48â¢

OR EUI-64â¢ NODE ADDRESS

The 24AA02XEXX is programmed at the factory with a

globally unique node address stored in the upper half

of the array and permanently write-protected. The

remaining 1,024 bits are available for application use.

FIGURE 9-1:

MEMORY ORGANIZATION

00h

Standard

EEPROM

80h

Write-Protected

Node Address Block

FFh

9.1.1

EUI-64â¢ SUPPORT USING THE

24AAXXXE48

The pre-programmed EUI-48 node address of the

24AAXXXE48 can easily be encapsulated at the

application level to form a globally 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.

Note:

As an alternative, the 24AAXXXE64

features an EUI-64 node address that can

be used in EUI-64 applications directly

without the need for encapsulation,

thereby simplifying system software. See

Section 9.2 âEUI-64â¢ Node Address

(24AAXXXE64)â for details.

9.1 EUI-48â¢ Node Address

(24AAXXXE48)

The 6-byte EUI-48â¢ node address value of the

24AAXXXE48 is stored in array locations 0xFA through

0xFF, as shown in Figure 9-2. The first three bytes are

the Organizationally Unique Identifier (OUI) assigned

to Microchip by the IEEE Registration Authority. The

remaining three bytes are the Extension Identifier, and

are generated by Microchip to ensure a globally

unique, 48-bit value.

Note:

Currently, Microchipâs OUIs are

0x0004A3, 0X001EC0, 0xD88039 and

0x5410EC, though this will change as

addresses are exhausted.

FIGURE 9-2:

EUI-48 NODE ADDRESS PHYSICAL MEMORY MAP EXAMPLE (24AAXXXE48)

Description

24-bit Organizationally

Unique Identifier

Data

00h

04h

A3h

Array

Address

FAh

24-bit Extension

Identifier

12h

34h

56h

FFh

Corresponding EUI-48â¢ Node Address: 00-04-A3-12-34-56

Corresponding EUI-64â¢ Node Address After Encapsulation: 00-04-A3-FF-FE-12-34-56

DS20002124G-page 14

ï£ 2008-2016 Microchip Technology Inc.

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