http://www.futureelectronics.com/en/Search.aspx?dsNav=Ntk:PartNumberSearch%7cPSoC+5LP%7c1%7c,Ny:True,Nea:True . This video, briefly explains what's an UDB. The video describes the PLD , Datapath and ALU, all of which are instrumental to the UDBs available in PSoC. https://youtu.be/lZL3eh3624A
