A method and apparatus for increasing the integrated circuit density in a
semiconductor assembly. The assembly includes a flexible interposer
substrate attached to an active surface and a back side of a first die,
the interposer substrate wrapping around at least one side of the first
die. The assembly also includes an array of discrete conductive elements
connected to bond pads of the first die through conductive traces and
exposed on an exterior surface of the interposer substrate for effecting
an external electrical connection. The assembly may include a second die
facing the first die and attached to the interposer substrate, the
interposer substrate being wrapped around either the first or second die
or, alternatively, being wrapped around both the first and second die.