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93AA46AE48TI データシート(PDF) 11 Page - Microchip Technology |
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93AA46AE48TI データシート(HTML) 11 Page - Microchip Technology |
11 / 26 page 2013-2016 Microchip Technology Inc. DS20005229C-page 11 93AA46AE48 3.0 PRE-PROGRAMMED EUI-48 NODE ADDRESS The 93AA46AE48 is programmed at the factory with a globally unique node address stored at the beginning of the array. It is preceded by the EEPROM Programmed Indicator (EPI), which indicates valid programming. The 93AA46AE48 is designed to be compatible with the following SMSC Ethernet controllers: LAN9210, LAN9211, LAN9215, LAN9217, LAN9218, LAN9220, and LAN9221. These controllers will automatically detect and load the EUI-48 node address from the 93AA46AE48 at start-up. 3.1 EUI-48 Node Address The 6-byte EUI-48 node address value of the 93AA46AE48 is stored in array locations 0x01 through 0x06, as shown in Figure 3-1. 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. 3.1.1 EUI-64 SUPPORT USING THE 93AA46AE48 The pre-programmed EUI-48 node address of the 93AA46AE48 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. 3.2 EEPROM Programmed Indicator (EPI) In addition to the node address, a programmed indicator code is stored at the location 0x00. The code is fixed as 0xA5. Its purpose is to let the master device know that the EEPROM has been programmed with a valid MAC address. FIGURE 3-1: EUI-48 NODE ADDRESS PHYSICAL MEMORY MAP EXAMPLE Note: Currently, Microchip’s OUIs are 0x0004A3, 0x001EC0, 0xD88039 and 0x5410EC, though this will change as addresses are exhausted. Note: The pre-programmed values are not write-protected and can be overwritten by the user. Care must be taken not to overwrite the values unintentionally. Description Data Array Address 24-bit Organizationally Unique Identifier 24-bit Extension Identifier Corresponding EUI-48™ Node Address: 00-04-A3-12-34-56 Corresponding EUI-64™ Node Address After Encapsulation: 00-04-A3-FF-FE-12-34-56 A5h 00h 04h A3h 12h 34h 56h 00h 01h 02h 03h 04h 05h 06h EPI |
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同様の説明 - 93AA46AE48TI |
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