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DFT in the 3rd dimension (or, “how do we go up from here?”)

Sometimes a post just begs to be written. Subconsciously, little reminders crop up in your input stream (a.k.a. eyes and ears) that prod you into doing something. Last week, like a Hitchcock blonde, it seemed like every time I turned around, something referring to 3-D technology popped out at me. I think it started when I began searching for material on JTAG implementations for MCMs…