AT24MAC402 ATMEL [ATMEL Corporation], AT24MAC402 Datasheet - Page 7

• Manufacturer Part Number: AT24MAC402
• Description: I2C-Compatible (2-wire) 2-Kbit Serial EEPROM
• Manufacturer: ATMEL [ATMEL Corporation]

3.1
3.2
3.3
EUI-48 Support
The EUI-48 address is stored in the last six bytes of the AT24MAC402’s extended memory block as shown in
For information on the protocol to read the EUI-48 value, see
page
Table 3-1.
Using an EUI-48 Value in an EUI-64 Application: An EUI-64 compatible value can be generated from the EUI-48 value
contained in the AT24MAC402 by concatenating the 24-bit OUI, an FFFEh data value, and the 24-bit Extension
Identifier. This is commonly referred to as an Encapsulated EUI-48 value. However, Atmel recommends using the
AT24MAC602 which contains a true EUI-64 value so that post read processing is not required by the application.
EUI-64 Support
For applications that utilize an EUI-64 standard, the EUI-64 address is stored in the last eight bytes of the
AT24MAC602’s extended memory block. Similar to EUI-48, the EUI-64 standard consists of the same three byte OUI
coupled with a five byte extension identifier (see
the OUI to guarantee a globally unique 64-bit EUI value and requires no additional data manipulation like other solutions
where the application must manually insert a two byte FFFEh value in between the OUI and Extension Identifier. For
information on how to read the EUI read protocol, see
15.
Table 3-2.
Note:
Non-Atmel OUI Programming Option
For customers with their own IEEE-assigned OUI or Company ID, Atmel offers the time saving option to manage and
deliver custom AT24MAC402/602 devices with their EUI-48/64 values uniquely pre-programmed at delivery. Contact
your local Atmel Sales Office for additional information.
Description
Memory Address
EUI Data Value
Description
Memory Address
EUI Data Value
15.
1.
48-Bit EUI Address Memory Map Example
64-Bit EUI Address Memory Map Example
The data values FFFEh and FFFFh are prohibited beginning from the 40-bit Extension Identifier in Byte 1
and Byte 2. These values are reserved for denoting an encapsulated MAC-48 or EUI-48 value for use in an
EUI-64 environment.
FCh
9Ah
FCh
98h
24-Bit OUI
24-Bit OUI
9Bh
C2h
C2h
99h
Table
9Ch
3Dh
9Ah
3Dh
“Device Addressing” on page 10
3-2). Atmel generates this unique 40-bit data value coupled with
“Device Addressing” on page 10
Byte 1
9Bh
48-Bit EUI
Byte 1
64-Bit EUI
9Dh
(1)
Atmel AT24MAC402/602 [DATASHEET]
Byte 2
9Ch
24-Bit Extension Identifier
40-Bit Extension Identifier
(1)
Byte 2
Byte 3
and
9Eh
9Dh
“Read Operations” on page
and
“Read Operations” on
8807A–SEEPR–6/12
Byte 4
9Eh
Byte 3
9Fh
Table
Byte 5
9Fh
3-1.
7