Abstract: The present invention is to provide an Ethernet switch fabric controller requiring output port buffer unit of less capacity while still working with an Ethernet switch to smoothly forward the packet from each input port of the Ethernet switch to an output port corresponding to the packet header at the input port. It is featured by the use of proper number of temporary buffer units each of proper length, and output port buffer unit of proper length.

Abstract: A process of manufacturing a trench capacitor having a hill structure includes the steps of providing a semiconductor substrate, forming a passivation layer on the semiconductor substrate, etching the passivation layer to form a trench defined by a side wall and a bottom surface, forming a spacer on the side-wall, wherein the bottom surface includes a first part covered by the spacer and a second part exposed from the spacer, forming a sacrificial layer between the spacer and the second part, and removing the sacrificial layer until the spacer has been fully removed to expose the first part wherein an etched rate of the sacrificial layer is slower than that of the spacer, thereby forming the trench capacitor with the hill structure.