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import pin
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# 一个指令周期
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FETCH = [
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# 把 pc(当前是0) 的值 输出到偏移地址寄存器中,
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pin.PC_OUT | pin.MAR_IN,
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# 内存根据上方修改后的偏移地址寄存器找到数据输出到总线上, IR 写入, 给PC 增加1
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pin.RAM_OUT | pin.IR_IN | pin.PC_INC,
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pin.PC_OUT | pin.MAR_IN,
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pin.RAM_OUT | pin.DST_IN | pin.PC_INC,
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pin.PC_OUT | pin.MAR_IN,
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pin.RAM_OUT | pin.SRC_IN | pin.PC_INC,
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]
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MOV = 0 << pin.ADDR_2_SHIFT | pin.ADDR_2 # 左移 留出来操作数位 然后再加上 ADDR_2的标志
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ADD = 1 << pin.ADDR_2_SHIFT | pin.ADDR_2
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NOP = 0b0
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HLT = 0b11_1111
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INSTRUCTIONS = {
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2: {
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MOV: { # 0b10000000
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# mov X任意寄存器, 5, 如果是mov a, 5 这个指令对应的前3个内存地址就是 1000_01_00 00000008(dst中保存的a寄存器编号是8) 00000101(src保存的数值是5, 等下SRC_OUT会输出到总线上)
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(pin.AM_REG, pin.AM_INS): [ # 1000_01_00 这是IR寄存器上保存的指令
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# 目的任意寄存器的控制线的编号X, 保存在了DST寄存器中中, 输出到读写控制器控制使X寄存器打开写
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# 写入 SRC寄存器中保存的立即数
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# 这是控制读写寄存器操作寄存器控制器的值
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pin.DST_W | pin.SRC_OUT,
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],
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(pin.AM_REG, pin.AM_REG): [ # mov a, b
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pin.DST_W | pin.SRC_R
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# SRC_R 和 SRC_OUT的区别是:
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# - SRC_R 是被读写控制器控制的表示, SRC_R内保存的值是一个寄存器编号, 此时把这个编号传到 寄存器控制器中然后把这个指定的寄存器数据传到总线上
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# - SRC_OUT 是把直接SRC寄存器中的数据输出到总线
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],
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(pin.AM_REG, pin.AM_DIR): [ # mov a, [0x5]
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pin.SRC_OUT | pin.MAR_IN, # 把0x5从src寄存器, 通过偏移地址寄存器传到 内存控制器中
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pin.DST_W | pin.RAM_OUT # 把上面传到内存控制器中的地址, 输出到DST_W中的a寄存器中
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],
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(pin.AM_REG, pin.AM_RAM): [ # mov a, [b]
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pin.SRC_R | pin.MAR_IN, # 把SRC_R中的b寄存器编号, 通过偏移地址寄存器MAR传到 内存控制器中
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pin.DST_W | pin.RAM_OUT
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],
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(pin.AM_DIR, pin.AM_INS): [ # mov [0x2f], 5
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pin.DST_OUT | pin.MAR_IN, # 把0x2f这个地址, 从dst寄存器, 通过偏移地址寄存器传到 内存控制器中
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pin.SRC_OUT | pin.RAM_IN
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],
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(pin.AM_DIR, pin.AM_REG): [ # mov [0x0], a
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pin.DST_OUT | pin.MAR_IN,
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pin.SRC_R | pin.RAM_IN
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],
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(pin.AM_DIR, pin.AM_DIR): [ # mov [0x0], [0x2f]
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pin.SRC_OUT | pin.MAR_IN,
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pin.T1_IN | pin.RAM_OUT,
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pin.DST_OUT | pin.MAR_IN,
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pin.T1_OUT | pin.RAM_IN
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],
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(pin. AM_DIR, pin.AM_RAM): [ # mov [0x0], [a]
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pin.SRC_R | pin.MAR_IN,
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pin.T1_IN | pin.RAM_OUT,
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pin.DST_OUT | pin.MAR_IN,
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pin.T1_OUT | pin.RAM_IN
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],
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(pin.AM_RAM, pin.AM_INS): [ # mov [a], 0x5
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pin.DST_R | pin.MAR_IN,
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pin.SRC_OUT | pin.RAM_IN
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],
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(pin.AM_RAM, pin.AM_REG): [ # mov [a], c
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pin.DST_R | pin.MAR_IN,
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pin.SRC_R | pin.RAM_IN
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],
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(pin.AM_RAM, pin.AM_DIR): [ # mov [a], [0x5]
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pin.SRC_OUT | pin.MAR_IN,
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pin.T1_IN | pin.RAM_OUT,
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pin.DST_R | pin.MAR_IN,
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pin.T1_OUT | pin.RAM_IN
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],
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(pin.AM_RAM, pin.AM_RAM): [ # mov [a], [b]
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pin.SRC_R | pin.MAR_IN,
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pin.T1_IN | pin.RAM_OUT,
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pin.DST_R | pin.MAR_IN,
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pin.T1_OUT | pin.RAM_IN
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],
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}
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},
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1: {
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},
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0: {
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NOP: [
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pin.CYC,
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],
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HLT: [
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pin.HLT,
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]
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}
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}
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if __name__ == "__main__":
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print(FETCH)
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