4-bit Bit-Slice Arithmetic Logic Unit for 32-bit RSFQ Microprocessors

  title={4-bit Bit-Slice Arithmetic Logic Unit for 32-bit RSFQ Microprocessors},
  author={Guang-Ming Tang and Kensuke Takata and Masamitsu Tanaka and Akira Fujimaki and Kazuyoshi Takagi and Naofumi Takagi},
  journal={IEEE Transactions on Applied Superconductivity},
A 4-bit bit-slice arithmetic logic unit (ALU) for 32-bit rapid single-flux-quantum microprocessors was demonstrated. The proposed ALU covers all of the ALU operations for the MIPS32 instruction set. It processes bit-sliced 32-bit data that are divided into eight slices of 4 bits. The bit-slice approach simplifies the circuit structure and reduces the hardware cost. The ALU uses synchronous concurrent-flow clocking and consists of eight pipeline stages. It was implemented using the 1.0-μm Nb… 

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