A 32-bit RISC Microprocessor with DSP Functionality : Rapid Prototyping

概要

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We have designed a 32-bit RISC microprocessor with 16-/32-bit fixed-point DSP functionality. This processor, called YD-RISC, combines both general-purpose microprocessor and digital signal processor (DSP) functionality using the reduced instruction set computer (RISC) design principles. It has functional units for arithmetic operation, digital signal processing (DSP) and memory access. They operate in parallel in order to remove stall cycles after DSP or load/store instructions, which usually need one or more issue latency cycles in addition to the first issue cycle. High performance was achieved with these parallel functional units while adopting a sophisticated five-stage pipeline structure. The pipelined DSP unit can execute one 32-bit multiply-accumulate (MAC) or 16-bit complex multiply instruction every one or two cycles through two 17-b×17-b multipliers and an operand examination logic circuit. Power-saving techniques such as power-down mode and disabling execution blocks allow low power consumption. In the design of this processor, we use logic synthesis and automatic place-and-route. This top-down approach shortens design time, while a high clock frequency is achieved by refining the processor architecture.
社団法人電子情報通信学会の論文
2001-05-01