Goal: create 3D cubes of silicon
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Process:
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"Thin" die to 7 mils or smaller
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"Glue" together
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Plate wires on sides
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Stacks of 70 or more have been demonstrated
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Ideal for PIMs
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Same chip type throughout
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Most side wires: common or chip-chip
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"Contact explosion" avoidable
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Problems Today: >2 side wiring, Power
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