riscv32isimulator/code/data_mem.py

from binandint import *


class data_mem:
    memory = [8 * '0'] * 4 * 1024 * 16

    def __init__(self) -> None:
        pass

    def mem(self, write_en, read_en, address, data_in, funct3
            ):  # 写使能，读使能，(使能为int的0或1)地址，输入数据，func3              #输出为data_out
        if write_en:
            if funct3 == '000':  # sb
                self.memory[address] = InttoBin(data_in % 2**8, 8)
            elif funct3 == '001':  # sh
                temp = InttoBin(data_in % 2**16, 16)
                self.memory[address + 1] = temp[0:8]
                self.memory[address] = temp[8:16]
            elif funct3 == '010':  # sw
                temp = InttoBin(data_in, 32)
                self.memory[address + 3] = temp[0:8]
                self.memory[address + 2] = temp[8:16]
                self.memory[address + 1] = temp[16:24]
                self.memory[address] = temp[24:32]
            else:
                pass

        if read_en:
            if funct3 == '000':  # lb
                data_out = BintoInt(self.memory[address])
            elif funct3 == '001':  # lh
                data_out = BintoInt(self.memory[address + 1] +
                                    self.memory[address])
            elif funct3 == '010':  # lw
                data_out = BintoInt(self.memory[address + 3] +
                                    self.memory[address + 2] +
                                    self.memory[address + 1] +
                                    self.memory[address])
            elif funct3 == '100':  # lbu
                data_out = BintoUInt(self.memory[address + 1] +
                                     self.memory[address])
            elif funct3 == '101':  # lhu
                data_out = BintoUInt(self.memory[address + 3] +
                                     self.memory[address + 2] +
                                     self.memory[address + 1] +
                                     self.memory[address])
            else:
                data_out = '0' * 32
        return data_out