24AA256UID View Datasheet(PDF) - Microchip Technology

Part Name

Description

Manufacturer

24AA256UID

256K I2C Serial EEPROM with EUI-48™, EUI-64™ and Unique 32-Bit Serial Number

Microchip Technology 

24AA256UID

FIGURE 9-2:

SERIAL NUMBER PHYSICAL MEMORY MAP EXAMPLE

Manufacturer

Description

Code

Device

Code

32-bit Serial Number

Data

29h

48h

12h

34h

56h

78h

Type

Array

Address

Fixed

7FFAh

7FFBh

7FFCh

Serialized

7FFDh

7FFEh

7FFFh

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. The

remaining three bytes are the Extension Identifier, and

are generated by Microchip to ensure a globally

unique, 48-bit value.

Note:

Currently, Microchip’s OUIs are

0x0004A3, 0x001EC0, 0xD88039 and

0x5410EC, though this will change as

addresses are exhausted.

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. The

remaining five bytes are the Extension Identifier, and

are generated by Microchip to ensure a globally

unique, 64-bit value.

Note:

Currently, Microchip’s OUIs are

0x0004A3, 0x001EC0, 0xD88039 and

0x5410EC, though this will change as

addresses are exhausted.

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-48 NODE ADDRESS PHYSICAL MEMORY MAP EXAMPLE

Description

24-bit Organizationally

Unique Identifier

Data

00h

04h

A3h

Array

Address

7F7Ah

24-bit Extension

Identifier

12h

34h

56h

7F7Fh

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

DS20005215C-page 14

 2013-2016 Microchip Technology Inc.

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