An Architecture Design Guideline for RISC-V Extension and Speed improvement with Pipeline deepening.

This repository is about benchmarking and analyzing the results of extended RISC-V Processor based on basic_RV32s and ima_make_RV64.

• basic_RV32s
  Traditional MIPS 5-Stage Pipeline architectured RISC-V RV32I Processor implementation based on Patterson-Hennessy Methodology.
• ima_make_RV64
  Based on basic_RV32s' microarchitecture, expands the design with M, A RISC-V standard extension for supporting Linux and improve performance by operating speed optimization and adopting Advanced Computer architectural theory.

• RV32s: Vivado ready RV32 Project files for all configurations
• RV64s: Vivado ready RV64 Project files for all configurations
• benchmarks: CoreMark and Dhrystone RISC-V ported source codes and .mem file for Synthesis
• codes: RTL only directory for all configurations
• docs: block diagram of core architectures and document about architecture specifications and design logics

• Show how to extend a RISC-V ISA with M-extension while using modular verilog design.
• Suggest an 8-stage pipeline extension roadmap for RISC-V basic 5-Stage pipeline Processor.
• Timing Closure methodology for improving clock speed.
• Benchmark performance with Dhrystone 2.1, CoreMark and analyze the results.

Based on MIPS 5-Stage architecture, basic_RV32s' architecture was designed, and extended to 8-stage originally by Hyunwoo Kang.

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• Vivado 2025.2
• Synthesis: Flow_PerfOptimized_high
• Implmentation: Performance_ExplorePostRoutePhysOpt
• FPGA
  • Digilent Nexys Video
    (AMD Xilinx Artix-7 XC7A200T-1SBG484C : speed grade = -1)

Used 2 benchmark programs.

• Dhrystone 2.1
  • -O2, 300,000 iterations, no main source code modifications.
• Coremark
  • -O2, Standard 2,000 iterations, no main source code modifications.

Benchmarked 10 Different extension/clock-speed/architecture setups.

• RV32I

  1. RV32I46F_5SP = RV32I, 46 Instructions, 5-Stage Pipelined

• RV64I

  1. RV64I59F_5SP

• RV64IM

  1. RV64IM72F_5SP
  2. RV64IM72F_6SP
  3. RV64IM72F_7SP
  4. RV64IM72F_8SP

• RV32IM

  1. RV32IM54F_5SP
  2. RV32IM54F_6SP
  3. RV32IM54F_7SP
  4. RV32IM54F_8SP