W90210F Datasheet, PDF (23/67 Pages) Winbond – PA-RISC EMBEDDED CONTROLLER

W90210F
(1) Correct prediction
CLK
CLK
CLK
CLK
CLK
CLK
CLK
IA
IF
FR
EX
MM
WR
conditional branch
IA
IF
FR
EX
MM
WR
delay slot
IA
IF
FR
EX
MM
WR
(2) Incorrect prediction
CLK
CLK
CLK
CLK
CLK
CLK
CLK
IA
IF
FR
EX
MM
WR
conditional branch
IA
IF
FR
EX
MM
WR
delay slot
IA
IF
FR
EX
MM
WR
IA
IF
FR
EX
MM
Figure 6.2 Pipeline operation for branch prediction.
predict address
CLK
predict address (nullified)
WR
correct address
6.2 Load use interlock
Load use interlock: A one-cycle interlock will be forced by hardware when load use dependence occurs.
CLK
CLK
CLK
CLK
CLK
CLK
CLK
CLK
IA
IF
FR
EX
MM
WR
Load r1
IA
IF
FR
EX
EX
MM
WR
r1 used
IA
IF
FR
FR
EX
MM
WR
IA IF IA
IF
FR
EX
MM
WR
Figure 6.3 Load-use interlock pipeline operation
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Version 1.4, 10/8/97