Patent ID: 6534847
Filing Date: 2003-03-18
Classification: H01L

Abstract:
A semiconductor device comprising:a semiconductor substrate; a circuit formed on said semiconductor substrate so as to achieve a desired function by being connected to and thereby functionally complemented or enhanced by another semiconductor device having a predetermined function; a device-to-device connection portion formed on said semiconductor substrate so as to connect said circuit to said other semiconductor device having the predetermined function; an external connection portion formed on said semiconductor substrate to connect with said device-to-device connection so as to allow input/output of a signal from/to an external device; and a switcher formed on said semiconductor substrate so as to switch between a state in which said circuit is disconnected from said external connection portion and a state in which said circuit is connected to said external connection portion, wherein said switcher disconnects said circuit from said external connection portion when said other semiconductor device is connected to said device-to-device connection portion, and connects said circuit to said external connection portion so that a signal from said circuit is fed out through said external connection portion when said other semiconductor device is not connected to said device-to-device connection portion.