is the EEPROM optional or must be used? If we don't use EEPROM, any limitation for the application? Thanks.
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Most registers in Table 3. TUSB8041-Q1 Register Map will impact the USB Hub descriptors. See the full section 8.5 of datasheet for more details on these registers. Below is a list of examples where customer would need to implement a EEPROM. This list excludes features that can be configured through GPIO.