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verilogrisc's Introduction

verilogRisc

  • Fork 蜂鸟E203,做一些个人的修改
  • 以此学习熟悉处理器结构

  • Evaluate
    • 用于YJ432上验证xilinx AXI-EMC ip
    • 优化取指令,ITCM改为32bit,强制取指32bit对齐,从ITCM和DM取指
    • DM从memory改换到BIU
    • memory只剩下AXI-EMC
    • MAC指令集已删除
    • 主频提升至50MHZ
    • 裁剪外设
    • 通过测试

  • Analysis
    • Feature(已经清理的内容,部分从验证来看,是有问题的)
    • 删除16位指令,ITCM使用32位,以此可以排除大量取指的case
    • 删除C指令集,因为编译系统限制,必须一同删除A指令集,当前为IM指令集
    • ifu
      • 仅能从itcm取指
      • itcm仅能存指令
      • itcm仅能由ifu访问
        • 指令需要在编译比特流时写入sram
    • lsu
      • 能从dtcm或biu访存
      • dtcm静止外部访问
      • 禁用协处理器访存

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