@[]
FT阶段
这里是固定不变的
FT0:FT_0 :FT0:
PC−>MARPC->MARPC−>MAR
FT1FT_1FT1
M−>MDR−>IRM->MDR->IRM−>MDR−>IR
PC−>PC+1PC->PC+1PC−>PC+1
ST阶段
这里对应源操作数 :
-
RRR寄存器寻址
ST0ST_0ST0- Ri−>CR_i->CRi−>C
-
(R)(R)(R)寄存器间址
ST0:ST_0:ST0:- Ri−>MARR_i->MARRi−>MAR
ST1:ST_1:ST1:
- M−>MDR−>CM->MDR->CM−>MDR−>C
-
−(R)-(R)−(R)自减型间址
ST0:ST_0:ST0:- Ri−1−>ZR_i-1->ZRi−1−>Z
ST1ST_1ST1
- Z−>MAR,RiZ->MAR,R_iZ−>MAR,Ri
ST2ST_2ST2
- M−>MDR−>CM->MDR->CM−>MDR−>C
-
I/(R)+I/(R)+I/(R)+
ST0:ST_0 :ST0:- R−>MARR->MARR−>MAR
ST1:ST_1 :ST1:
- M−>MDR−>CM->MDR->CM−>MDR−>C
ST2:ST_2 :ST2:
- Ri+1−>ZR_i+1->ZRi+1−>Z
ST3:ST_3 :ST3:
- Z−>RiZ->R_iZ−>Ri
-
DIDIDI
PC−>MARPC-> MARPC−>MAR
M−>MDR−>MARM->MDR->MARM−>MDR−>MAR
PCPCPC
DT阶段
反过来看目的操作数即可
ET阶段
如果 目的地址采用的是 寄存器寻址方式也就是RRR
那么就需要
ET0ET_0ET0
C−>RjC->R_jC−>Rj
否则就是进入
ET0ET_0ET0
C−>MDRC->MDRC−>MDR
MDR−>MMDR->MMDR−>M
习题3-12
MOV R0,R2
FT0 PC->MAR
FT1 M->MDR->IR,PC+1->PC
ST0 R2->C
DT0 无
ET0 C->R0
MOV R1,(PC)+
FT0 PC->MAR
FT1 M->MDR->IR,PC+1->PC
ST0 PC->MAR
ST1 M->MDR->C
ST2 PC+1->Z
ST3 Z->PC
DT0 无
ET0 C->MDR
ET1 MDR->M
MOV (R1),-(SP)
FT0 PC->MAR
FT1 M->MDR->IR,PC+1->PC
ST0 SP-1->Z
ST1 Z->MAR,SP
ST2 M->MDR->C
DT R1->MAR
ET0 C->MDR
ET1 MDR->M
MOV (R0)+,X(R3)
FT0 PC->MAR
FT1 M->MDR->IR,PC+1->PC
ST0 PC->MAR
ST1 M->MDR->D,PC+1->PC
ST2 D+R3->Z
ST3 Z->MDR
ST4 M->MDR->C
DT0 RO->MAR
DT1 R0+1->Z
DT2 Z->R0
ET0 C->MDR
ET1 MDR->M
MOV (R0),(PC)+
FT0 PC->MAR
FT1 M->MDR->IR,PC+1->PC
ST0 PC->MAR
ST1 M->MDR-C
ST2 PC+1->Z
ST3 Z->PC
DT0 R0->MAR
ET0 C->MDR
ET1 MDR->M
MOV (SP)+,DI
FT0 PC->MAR
FT1 M->MDR->IR,PC+1->PC
ST0 PC->MAR
ST1 M->MDR->MAR,PC+1->PC
ST2 M->MDR->C
DT0 SP->MAR
DT1 SP+1->Z
DT2 Z->SP
ET0 C->MDR
ET1 MDR->M