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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...
We report an energy-efficient bit-serial microprocessor based on single-flux-quantum (SFQ) logic, called CORE e3, using a low-voltage bias technique. This microprocessor was designed for integrating memories, and we developed it to investigate the efficient use of hardware and energy, using the low-voltage rapid single-flux-quantum (LV-RSFQ) technique. We implemented the CORE e3 and its test circuit...
We report recent progress in the development of rapid single-flux-quantum (RSFQ) microprocessors integrated with random access memories (RAMs) based on bit-serial processing, called CORE e series. The bit-serial processing is an efficient, unique approach for RSFQ microprocessors that target ultrafast clock frequency with small hardware size. The CORE e series have a richer instruction set and RAMs...
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