[quote]2. Microchip 25AA02E48 has MAC address??? I think the chip is EEPROM. So how do you use it instead of MAC address??
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Yes, Microchip 25AA02E48 has a MAC address wrote by Microchip in the location from FAh to FFh
The first 128 bytes is available to the user to be used as EEprom memory.
The uC can read the MAC from the Microchip and then program it to the W5100
For small production is the best choice in my opinion.
Hi,
You can use the mac address of microchips 25AA02E48.
25AA02E48 have already unique EUI-48bit MAC address. You can use it.
Notice that the MAC address should be unique.