Instruction Set Extensions for Multi-Threading in

Abstract — This paper describes instruction set extensions for a variant of multi-threading called micro-threading for the LEON3 SPARCv8 processor. We show an architecture of the developed processor and its key blocks- cache controller, register file, thread scheduler. The processor has been implemented in a Xilinx Virtex2Pro FPGA. The extensions are evaluated in terms of extra resources needed, and the overall performance of the developed processor is evaluated on a simple DSP computation typical for embedded systems. I