TUSB8020B: Does not attach upstream port to PC

Part Number: TUSB8020B

Tool/software:

We built our own PCB with TUSB8020B without EEPROM and without SMBus interface. Unlike the EVAL-Board our solution does not attach the upstream port to the PC until the cfgActive Flag is set via SMB. How is the TUSB8020B in the EVAL-Board configured so that it immediately attach after power on?