MCP79400 datasheet(41/62 Pages) MICROCHIP

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DS20005009F-page 41

MCP79400/MCP79401/MCP79402

6.3

Pre-Programmed EUI-48™ or

EUI-64™ Node Address

The MCP79401 and MCP79402 are programmed at

the factory with a globally unique node address stored

in the protected EEPROM block.

6.3.1

EUI-48™ NODE ADDRESS

(MCP79401)

The 6-byte EUI-48™ node address value of the

MCP79401 is stored in EEPROM locations 0xF2

through 0xF7, as shown in Figure 6-11. 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.

6.3.1.1

EUI-64™ Support Using the

MCP79401

The pre-programmed EUI-48 node address of the

MCP79401 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

6.3.2

EUI-64™ NODE ADDRESS

(MCP79402)

The 8-byte EUI-64™ node address value of the

MCP79402 is stored in array locations 0xF0 through

0xF7, as shown in Figure 6-12. 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

Microchip

ensure

globally-unique, 64-bit value.

FIGURE 6-11:

EUI-48 NODE ADDRESS PHYSICAL MEMORY MAP EXAMPLE (MCP79401)

Note:

Currently,

Microchip's

OUIs

are

0x0004A3, 0x001EC0, 0xD88039 and

0x5410EC, though this will change as

addresses are exhausted.

Note:

As an alternative, the MCP79402 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

Figure 6-12 for details.

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

encapsulate

EUI-48

addresses into EUI-64 addresses.

F2h

F7h

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

Corresponding EUI-64™ Node Address After Encapsulation:

00-04-A3-FF-FE-12-34-56

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