Optical communication module

An optical communication module that accepts first NVR data for initial setting from an external host and writes and stores the first NVR data into either an EEPROM or a flash memory of a microcomputer, and that transfers and sets the first NVR data to an NVR data register of a physical-layer unit having a communications function via a first serial bus, when a system including said module is started up, said physical-layer unit carrying out communications based on the first NVR data set to the NVR data register of said physical-layer unit, said physical-layer unit comprising:

• a first control unit for receiving a write destination address and second NVR data associated with the write destination address from the host via a second serial bus for transmission of various management data between the host and said physical-layer unit, and for carrying out serial/parallel conversion of the write destination address received and the second NVR data, and storing the write destination address received and the second NVR data in registers of said first control unit, respectively;
• and
• a second control unit for copying the store write destination address and the second NVR data stored to corresponding registers of said second control unit, respectively, and for carrying out parallel/serial conversion of the write destination address and the second NVR data which are copied to the corresponding registers, respectively, and sending the write destination address and the second NVR data to either the EEPROM or the flash memory of the microcomputer, as well as a write command, via the first serial bus to write the second NVR data into either the EEPROM or the flash memory of the microcomputer.