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MAINPROGRAMFETCHESFAST INTERRUPTSERVICE ROUTINEFETCHESINFINITELOOP{II (NOP)1--__ "_6__--1NO FETCHNO FETCH(a) Instruction Fetches from MemoryILLEGAL INSTRUCTION INTERRUPTRECOGNIZED AS PENDINGILLEGAL INSTRUCTION INTERRUPTRECOGNIZED AS PENDINGINTERRUPT CONTROL CYCLE 1iINTERRUPT CONTROL CYCLE 2iFETCHDECODEEXECUTEINSTRUCTION CYCLE COUNT 1n1 n2 n3n1 n2n12 3 4n4 n5 n6 -n3 n4 II -rQ rG Ill- NJP5 6 7 8- ii1 ii2 n5- - i1 ii2 /I- - - ii1 ii2 I\Ol9 10 11 12 13 14iINTERRUPTii INTERRUPT INSTRUCTION WORDII = ILLEGAL INSTRUCTION" = NORMAL INSTRUCTION WORD(b) Program Controller PipelineFigure 7-4 Illegal Instruction Interrupt Serviced by a Fast Interrupt

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