PCI9052 has a 64-byte configuration space header area and a 84 bytes of local configuration registers may be made by the serial EEPROM to configure it. First when the host starts testing the serial EEPROM, incomplete if the EEPROM is installed and the first 48 bits is 1, the value in the EEPROM is used to configure the PCI9052 register, otherwise, use default values [5]. In this design, the EEPROM using Atmel's E2PROM-AT24C02a.
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