Renesas M32R-FPU - Manual (Page 171)

APPENDICES
APPENDICES-13 M32R-FPU Software Manual (Rev.1.01)
Appendix Figure 3.2.4 Pipeline Flow with Stalls (2)
<Case 3> A branch instruction is executed (except for the case in which no branch occurs
at a conditional branch instruction)
IF D E WB Branch Instruction
IF D WB E
IF D WB E stall stall
stall
IF D WB E stall
IF D
Bypass process
branch instruction is executed
stall stall
<Case 4> The subsequent instruction uses an operand read from the memory
IF D E WB LD R1 ,@R2
IF D WB
MEM2 MEM1
ADD R3, R1 stall stall
IF
Bypass process
IF D E WB LD R1 ,@R2
IF D WB
MEM2 MEM1
IF D E ADD R4,R5 WB
ADD R3, R1 stall
Bypass process
IF D E WB LD R1 ,@R2
IF EM D E2 WB EA
MEM2 MEM1
IF D E ADD R4,R5 WB
FMADD R1 ,R6,R7
Bypass process
IF D E WB LD R1 ,@R2
IF D WB E
MEM2 MEM1
IF D E ADD R4,R5 WB
IF D E ADD R6,R7 WB
ADD R3, R1
E
E
APPENDIX 3
Appendix 3 Pipeline Processing