SST26VF032BEUI datasheet(72/76 Pages) MICROCHIP

72 / 76 page

SST26VF032BEUI

DS20006152A-page 72

 2019 Microchip Technology Inc.

11.2

Pre-Programmed EUI-48 and EUI-

64 Address

The SST26VF032BEUI is programmed at the factory

with a globally unique address stored in the SFDP ven-

dor parameter table and it is permanently write-

protected.

11.2.1

EUI-48 ADDRESS

The

byte

EUI-48

address

value

the

SST26VF032BEUI is stored in the SFDP table at

address locations 0x261 through 0x266, as shown in

Figure 11-1. The first three bytes are the Organization-

ally 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.

11.2.2

ORGANIZATIONALLY UNIQUE

IDENTIFIERS (OUIS)

Each OUI provides roughly 16M (224) addresses. Once

the address pool for an OUI is exhausted, Microchip

will acquire a new OUI from IEEE to use for program-

ming this model. For more information on past and

current OUIs, see “Organizationally Unique Identifiers

for Preprogrammed EUI-48 and EUI-64 Address

Devices” Technical Brief, (DS90003187).

11.2.3

EUI-64 SUPPORT USING THE EUI-

The

pre-programmed

EUI-48

address

the

SST26VF032BEUI can easily be encapsulated at the

application level to form a globally unique, 64-bit

address for systems utilizing the EUI-64 standard. This

is done by adding 0xFFFE between the OUI and the

Extension Identifier, as shown below in Figure 11-1.

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

Corresponding EUI-64™ Address after Encapsulation: 00-04-A3-FF-FE 12-34-56

Note:

The OUI will change as addresses are

exhausted. Customers are not guaran-

teed to receive a specific OUI and should

design their application to accept new

OUIs as they are introduced.

Note:

As an alternative, SST26VF032BEUI

features an EUI-64 address that can be

used in EUI-64 applications directly with-

out the need for encapsulation, thereby

simplifying

system

software.

See

Section 11.2.4,

EUI-64 Address

for

details.

FIGURE 11-1:

EUI-48™ ADDRESS PHYSICAL MEMORY MAP EXAMPLE

Octet

012345

Description

24-bit Organizationally Unique

Identifier

24-bit Extension Identifier

Data

00h

04h

A3h

12h

34h

56h

SFDP Address

266h

261h

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