Patent ID: 8294284

Claim:
A packaged microelectronic element, comprising: a package element, said package element including: a dielectric element having a bottom face and a top face remote from said bottom face and first and second bond windows extending between said top and bottom faces; a plurality of chip contacts disposed at said top face adjacent to said first and second bond windows; first and second sets of package contacts exposed at first and second diagonally opposite corner regions of said top face, said first and second sets conductively connected to said chip contacts; a microelectronic element adjacent to said bottom face; bond wires extending through said first and second bond windows to conductively connect said microelectronic element to said chip contacts; and third and fourth sets of package contacts exposed at third and fourth diagonally opposite corner regions of said top face, wherein said package element is configured such that upon a first such packaged microelectronic element being assembled with a second such packaged microelectronic element rotated relative to said first packaged microelectronic element, said first and second sets of package contacts of said first packaged microelectronic element are joinable with said third and fourth sets of package contacts of said second packaged microelectronic element, respectively, and bond pads on a face of said microelectronic element of said first packaged microelectronic element are exposed by said package element of said second packaged microelectronic element.