I’m looking for a full datasheet and any information on register/EEPROM settings to configure a BCM53128 as an unmanaged switch.

Hello Joseph, the manufacture placed their documents here:

Search Results

this is the only place I found their information on this part…

Is it possible to escalate this with Broadcom? They don’t make any detailed information available for the BCM53128 on their public website and their support has advised me to go through the distributor for support.