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AT24MAC602-MA11M-T Datasheet(PDF) 7 Page - ATMEL Corporation |
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AT24MAC602-MA11M-T Datasheet(HTML) 7 Page - ATMEL Corporation |
7 / 28 page 7 Atmel AT24MAC402/602 [DATASHEET] 8807A–SEEPR–6/12 3.1 EUI-48 Support The EUI-48 address is stored in the last six bytes of the AT24MAC402’s extended memory block as shown in Table 3-1. For information on the protocol to read the EUI-48 value, see “Device Addressing” on page 10 and “Read Operations” on page 15. Table 3-1. 48-Bit EUI Address Memory Map Example 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. 3.2 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 Table 3-2). Atmel generates this unique 40-bit data value coupled with 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 “Device Addressing” on page 10 and “Read Operations” on page 15. Table 3-2. 64-Bit EUI Address Memory Map Example Note: 1. 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. 3.3 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. 48-Bit EUI Description 24-Bit OUI 24-Bit Extension Identifier Memory Address 9Ah 9Bh 9Ch 9Dh 9Eh 9Fh EUI Data Value FCh C2h 3Dh Byte 1 Byte 2 Byte 3 64-Bit EUI Description 24-Bit OUI 40-Bit Extension Identifier Memory Address 98h 99h 9Ah 9Bh 9Ch 9Dh 9Eh 9Fh EUI Data Value FCh C2h 3Dh Byte 1(1) Byte 2(1) Byte 3 Byte 4 Byte 5 |
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