An apparatus that may include a base layer of a platform application specific integrated circuit (ASIC) and a mixed-signal function. The base layer of the platform application specific integrated circuit (ASIC) generally comprises a plurality of pre-diffused regions disposed around a periphery of the platform ASIC. Each of the pre-diffused regions may be configured to be metal-programmable. The mixed-signal function may include two or more sub-functions formed with a metal mask set placed over a number of the plurality of pre-diffused regions.