Question: Is it compulsory to use the External EEPROM with the HX2VL hub?
No. EEPROM use is optional. HX2VL does provide pin-strap to reconfigure settings, such as number of DS ports, number of removable ports, bus/self power, and gang/individual mode without an EEPROM. However, if the product needs to be logo certified, HX2VL must use EEPROM to store its own unique VID/PID.