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Pipeline flow:
Instruction n
Instruction n+1
Instruction n+2
Instruction n+3
Order of detection:
General illegal instruction exception (instruction n+1) and
TLB miss (instruction n+2) are detected simultaneously
TLB miss (instruction n)
Order of exception handling:
TLB miss (instruction n)
Re-execution of instruction n
General illegal instruction exception
(instruction n+1)
Re-execution of instruction n+1
TLB miss (instruction n+2)
Re-execution of instruction n+2
Execution of instruction n+3
Figure 5.3 Example of General Exception Acceptance Order
Rev. 6.0, 07/02, page 134 of 986
TLB miss (data access)
IF
ID
EX
MA
IF
ID
EX
MA
General illegal instruction exception
TLB miss (instruction access)
IF
ID
EX
IF
ID
Program order
WB
WB
MA
WB
IF:
ID: Instruction decode
EX: Instruction execution
EX
MA
WB
MA: Memory access
WB: Write-back
1
2
3
4
Instruction fetch
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