MSR = 1
MAR = 2
MDR = 3
RAM = 4
IR = 5
DST = 6
SRC = 7
A = 8
B = 9
C = 10
D = 11
DI = 12
SI = 13
SP = 14
BP = 15
CS = 16
DS = 17
SS = 18
ES = 19
VEC = 20
T1 = 21
T2 = 22

MSR_OUT = MSR
MAR_OUT = MAR
MDR_OUT = MDR
RAM_OUT = RAM
IR_OUT = IR
DST_OUT = DST
SRC_OUT = SRC
A_OUT = A
B_OUT = B
C_OUT = C
D_OUT = D
DI_OUT = DI
SI_OUT = SI
SP_OUT = SP
BP_OUT = BP
CS_OUT = CS
DS_OUT = DS
SS_OUT = SS
ES_OUT = ES
VEC_OUT = VEC
T1_OUT = T1
T2_OUT = T2


_DST_SHIFT = 5


MSR_IN = MSR << _DST_SHIFT
MAR_IN = MAR << _DST_SHIFT
MDR_IN = MDR << _DST_SHIFT
RAM_IN = RAM << _DST_SHIFT
IR_IN = IR << _DST_SHIFT
DST_IN = DST << _DST_SHIFT
SRC_IN = SRC << _DST_SHIFT
A_IN = A << _DST_SHIFT
B_IN = B << _DST_SHIFT
C_IN = C << _DST_SHIFT
D_IN = D << _DST_SHIFT
DI_IN = DI << _DST_SHIFT
SI_IN = SI << _DST_SHIFT
SP_IN = SP << _DST_SHIFT
BP_IN = BP << _DST_SHIFT
CS_IN = CS << _DST_SHIFT
DS_IN = DS << _DST_SHIFT
SS_IN = SS << _DST_SHIFT
ES_IN = ES << _DST_SHIFT
VEC_IN = VEC << _DST_SHIFT
T1_IN = T1 << _DST_SHIFT
T2_IN = T2 << _DST_SHIFT


SRC_R = 1 << 10  # 读取 SRC 寄存器中的值, 这个值是寄存器编号
SRC_W = 1 << 11
DST_R = 1 << 12
DST_W = 1 << 13

PC_WE = 1 << 14
PC_CS = 1 << 15
PC_EN = 1 << 16


PC_OUT = PC_CS
PC_IN = PC_CS | PC_WE
PC_INC = PC_CS | PC_WE | PC_EN

_OP_SHIFT = 17

OP_ADD = 0 << _OP_SHIFT
OP_SUB = 1 << _OP_SHIFT
OP_INC = 2 << _OP_SHIFT
OP_DEC = 3 << _OP_SHIFT
OP_AND = 4 << _OP_SHIFT
OP_OR = 5 << _OP_SHIFT
OP_XOR = 6 << _OP_SHIFT
OP_NOT = 7 << _OP_SHIFT

ALU_OUT = 1 << 20
ALU_PSW = 1 << 21
ALU_INT_W = 1 << 22  # 中断有效
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)

ALU_STI = ALU_INT_W  # 中断有效, 默认开启中断了
ALU_CLI = ALU_INT_W | ALU_INT  # 开启中断, 并 使中断无效


CYC = 1 << 30  # 当前指令周期 清零, 执行下一个指令周期
HLT = 1 << 31  # 停止

ADDR_2 = 1 << 7  # 2指令标志 1xxx[aa][bb]
ADDR_1 = 1 << 6  # 1指令标志 01xxxx[aa]

ADDR_2_SHIFT = 4  # 指令需要左移4位 留出来操作数位  
ADDR_1_SHIFT = 2

AM_INS = 0b00  # 立即数  0x5
AM_REG = 0b01  # 寄存器  a
AM_DIR = 0b10  # 立即数寻址  [0x5]
AM_RAM = 0b11  # 寄存器间接寻址 [a]