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MAINPROGRAMFETCHES~~I~-lI~~INTEARlPTF81DN3n6n7n8n9rINTERRUPT SYNCHRONIZED ANDRECOGNIZED AS PENDINGINTERRUPT CONTROL CYCLE 1 IINTERRUPT CONTROL CYCLE 2 1%(a) Instruction Fetches from Memoryr-- INTERRUPTS RE ENABLEDIiFETCH REP n2 REPn4REPn6n7n8 iiI 112 n9DECODE REP NOP n2n2 n2 REP NOPn4n4 n4 REP NOPn6n6n6 n7 n8 111 i2 n9EXECUTE REP /lOPn2 n2 n2 REPNOPn4 n4 n4 REP NOP n6n6 n6 n7 n8 il i2 n9INSTRUCTION CYCLE COUNT 1 2 3 45 6 7 8910 11 12 1314 1516 17 18 19 20 21 22i = INTERRUPTii = INTERRUPT INSTRUCTION WORDn = NORMAL INSTRUCTION WORDi% = INTERRUPT REJECTED(b) Program Controller PipelineFigure 7-14 Interrupting Sequential REP Instructions

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