RTL8316 is 16-port 100Mbit switch controller. It is dumb switch controller. Only limited jumper-based configuration of HVLANs is avalable. See here for details. RRCP is NOT supported unlike newer RTL8316B

This chip considered depreciated, so no description nor datasheet is provided on manufacturer’s website.

Latest datasheet, that was available, was 1.72. Here is local copy: