Patent ID: 6977440

Claim:
A semiconductor chip assembly comprising: (a) a plurality of units, each such unit including: (i) a semiconductor chip having at least one chip select contact and a plurality of other contacts and (ii) a circuit panel having a plurality of chip select terminals, a plurality of other terminals, and traces extending on or in the panel electrically connected between the contacts of the chip and the terminals, the trace electrically connected to each chip select contact being a multi-branched trace including a common section connected to the select contact and a plurality of branches, each one of the plurality of branches being associated with a corresponding one of the chip select terminals and defining a gap between the associated chip select terminal and the common section, wherein at least one branch, but less than all branches, of each such multi-branched trace has a conductive element formed separately from the trace bridging the gap so that the chip select terminal associated with each branch having a conductive element is electrically connected to the common section of the multi-branch trace, said units being disposed one above the other in a stack of superposed units; and (b) vertical conductors interconnecting the terminals of the units in the stack to form a plurality of vertical buses, said chip select terminals of different units being connected to the same vertical buses, said conductive elements and said multi-branched traces being arranged so that the chip select contacts of different units are electrically connected to different ones of said vertical buses.