 |
Electronic Components Datasheet Search |
|
|
Electronic Components Datasheet Search |
|
25AA02E48 Datasheet(PDF) 13 Page - Microchip Technology |
|
||||||||||||||||||||||||||||||
25AA02E48 Datasheet(HTML) 13 Page - Microchip Technology |
|
|
13 / 28 page  2008-2016 Microchip Technology Inc. DS20002123F-page 13 25AA02E48/25AA02E64 3.0 PRE-PROGRAMMED EUI-48™ OR EUI-64™ NODE ADDRESS The 25AA02EXX is programmed at the factory with a globally unique node address stored in the upper 1/4 of the array and write-protected through the STATUS register. The remaining 1,536 bits are available for application use. FIGURE 3-1: MEMORY ORGANIZATION 3.1 Factory-Programmed Write Protection In order to help guard against accidental corruption of the node address, the BP1 and BP0 bits of the STATUS register are programmed at the factory to ‘0’ and ‘1’, respectively, as shown in the following table: This protects the upper 1/4 of the array (0xC0 to 0xFF) from write operations. This array block can be utilized for writing by clearing the BP bits with a Write Status Register (WRSR) instruction. Note that if this is performed, care must be taken to prevent overwriting the node address value. 3.2 EUI-48 ™ Node Address (25AA02E48) The 6-byte EUI-48™ node address value of the 25AA02E48 is stored in array locations 0xFA through 0xFF, as shown in Figure 3-2. 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. 3.2.1 EUI-64™ SUPPORT USING THE 25AA02E48 The pre-programmed EUI-48 node address of the 25AA02E48 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. FIGURE 3-2: EUI-48 NODE ADDRESS PHYSICAL MEMORY MAP EXAMPLE (25AA02E48) 7654 3 2 1 0 XXXX BP1 BP0 WEL WIP ——— — 01 —— 00h C0h FFh Write-Protected Node Address Block Standard EEPROM Note: Currently, Microchip’s OUIs are 0x0004A3, 0x001EC0, 0xD88039 and 0x5410EC, though this will change as addresses are exhausted. Note: As an alternative, the 25AA02E64 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 Section 3.3 “EUI-64™ Node Address (25AA02E64)” for details. FAh FFh 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 |
Similar Part No. - 25AA02E48_16 |
|
Similar Description - 25AA02E48_16 |
|
|
Link URL |
| Privacy Policy |
| ALLDATASHEET.COM |
| Does ALLDATASHEET help your business so far? [ DONATE ] |
About Alldatasheet | Advertisement | Datasheet Upload | Contact us | Privacy Policy | Link Exchange | Manufacturer List All Rights Reserved©Alldatasheet.com |
| Russian : Alldatasheetru.com | Korean : Alldatasheet.co.kr | Spanish : Alldatasheet.es | French : Alldatasheet.fr | Italian : Alldatasheetit.com Portuguese : Alldatasheetpt.com | Polish : Alldatasheet.pl | Vietnamese : Alldatasheet.vn Indian : Alldatasheet.in | Mexican : Alldatasheet.com.mx | British : Alldatasheet.co.uk | New Zealand : Alldatasheet.co.nz |
|
Family Site : ic2ic.com |
icmetro.com |
English ▼
English
Chinese
German
Japanese
Russian
Korean
Spanish
French
Italian
Portuguese
Polish
Vietnamese
Indian
Mexican
British
New Zealand
