24AA256UIDT-ISLASHST datasheet(13/28 Pages) MICROCHIP

13 / 28 page

 2013 Microchip Technology Inc.

DS20005215A-page 13

24AA256UID

FIGURE 9-2:

SERIAL NUMBER PHYSICAL MEMORY MAP EXAMPLE

9.2

EUI-48 Node Address

The 6-byte EUI-48 node address value is stored in

array locations 0x7F7A through 0x7F7F, as shown in

Figure 9-3.

The

first

three

bytes

are

the

Organizationally Unique Identifier (OUI) assigned to

Microchip by the IEEE Registration Authority. Currently,

Microchip’s OUIs are 0x0004A3 and 0x001EC0,

though this will change as addresses are exhausted.

The remaining three bytes are the Extension Identifier,

and are generated by Microchip to ensure a globally

unique, 48-bit value.

9.3

EUI-64 Node Address

The 8-byte EUI-64 node address value is stored in

array locations 0x7FB8 through 0x7FBF, as shown in

Figure 9-4.

The

first

three

bytes

are

the

Organizationally Unique Identifier (OUI) assigned to

Microchip by the IEEE Registration Authority. Currently,

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-48 NODE ADDRESS PHYSICAL MEMORY MAP EXAMPLE

7FFAh

7FFFh

Manufacturer

Code

32-bit Serial Number

29h

Description

Data

Array

Address

48h

12h

34h

56h

78h

Device

Code

Serialized

Fixed

Type

7FFBh

7FFCh

7FFDh

7FFEh

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

encapsulate

EUI-48

addresses into EUI-64 addresses.

7F7Ah

7F7Fh

24-bit Organizationally

Unique Identifier

24-bit Extension

Identifier

00h

04h

A3h

12h

34h

56h

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

Description

Data

Array

Address

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