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MSR = 1
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MAR = 2
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MDR = 3
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RAM = 4
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IR = 5
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DST = 6
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SRC = 7
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A = 8
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B = 9
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C = 10
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D = 11
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DI = 12
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SI = 13
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SP = 14
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BP = 15
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CS = 16
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DS = 17
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SS = 18
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ES = 19
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VEC = 20
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T1 = 21
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T2 = 22
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MSR_OUT = MSR
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MAR_OUT = MAR
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MDR_OUT = MDR
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RAM_OUT = RAM
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IR_OUT = IR
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DST_OUT = DST
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SRC_OUT = SRC
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A_OUT = A
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B_OUT = B
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C_OUT = C
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D_OUT = D
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DI_OUT = DI
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SI_OUT = SI
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SP_OUT = SP
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BP_OUT = BP
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CS_OUT = CS
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DS_OUT = DS
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SS_OUT = SS
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ES_OUT = ES
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VEC_OUT = VEC
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T1_OUT = T1
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T2_OUT = T2
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_DST_SHIFT = 5
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MSR_IN = MSR << _DST_SHIFT
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MAR_IN = MAR << _DST_SHIFT
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MDR_IN = MDR << _DST_SHIFT
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RAM_IN = RAM << _DST_SHIFT
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IR_IN = IR << _DST_SHIFT
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DST_IN = DST << _DST_SHIFT
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SRC_IN = SRC << _DST_SHIFT
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A_IN = A << _DST_SHIFT
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B_IN = B << _DST_SHIFT
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C_IN = C << _DST_SHIFT
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D_IN = D << _DST_SHIFT
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DI_IN = DI << _DST_SHIFT
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SI_IN = SI << _DST_SHIFT
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SP_IN = SP << _DST_SHIFT
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BP_IN = BP << _DST_SHIFT
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CS_IN = CS << _DST_SHIFT
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DS_IN = DS << _DST_SHIFT
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SS_IN = SS << _DST_SHIFT
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ES_IN = ES << _DST_SHIFT
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VEC_IN = VEC << _DST_SHIFT
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T1_IN = T1 << _DST_SHIFT
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T2_IN = T2 << _DST_SHIFT
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SRC_R = 1 << 10 # 读取 SRC 寄存器中的值, 这个值是寄存器编号
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SRC_W = 1 << 11
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DST_R = 1 << 12
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DST_W = 1 << 13
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PC_WE = 1 << 14
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PC_CS = 1 << 15
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PC_EN = 1 << 16
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PC_OUT = PC_CS
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PC_IN = PC_CS | PC_WE
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PC_INC = PC_CS | PC_WE | PC_EN
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_OP_SHIFT = 17
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OP_ADD = 0 << _OP_SHIFT
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OP_SUB = 1 << _OP_SHIFT
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OP_INC = 2 << _OP_SHIFT
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OP_DEC = 3 << _OP_SHIFT
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OP_AND = 4 << _OP_SHIFT
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OP_OR = 5 << _OP_SHIFT
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OP_XOR = 6 << _OP_SHIFT
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OP_NOT = 7 << _OP_SHIFT
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ALU_OUT = 1 << 20
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ALU_PSW = 1 << 21
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ALU_INT_W = 1 << 22 # 中断有效
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ALU_INT = 1 << 23 # 中断无效(他在电路中, 会把上次的中断状态保存下来)
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ALU_STI = ALU_INT_W # 中断有效, 默认开启中断了
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ALU_CLI = ALU_INT_W | ALU_INT # 开启中断, 并 使中断无效
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CYC = 1 << 30 # 当前指令周期 清零, 执行下一个指令周期
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HLT = 1 << 31 # 停止
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ADDR_2 = 1 << 7 # 2指令标志 1xxx[aa][bb]
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ADDR_1 = 1 << 6 # 1指令标志 01xxxx[aa]
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ADDR_2_SHIFT = 4 # 指令需要左移4位 留出来操作数位
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ADDR_1_SHIFT = 2
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AM_INS = 0b00 # 立即数 0x5
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AM_REG = 0b01 # 寄存器 a
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AM_DIR = 0b10 # 立即数寻址 [0x5]
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AM_RAM = 0b11 # 寄存器间接寻址 [a]
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