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This paper describes a new datapath generator that generates high-density mask layouts equivalent to handcrafted ones.An entry of the generator is a hierarchical symbolic layout at the gate level. Bit-and-row-slicing technique is a key feature to realize large-size and high-density datapath generation. A 21K transistor datapath was generated using 1-p CMOS technology, whose density is 5.64 KTr/mm * greater than the 5.38 KTr/mm2 of a hand-crafted datapath.

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