A processor of type CISC has repertory of 582 commands withmedium time of implem

Question

A processor of type CISC has repertory of 582 commands withmedium time of implementation of command CPIC = 8,0 circles (tc)per command. The frequency of operation (fc = 1/tc) are 1,5 GHz. Asecond processor, type RISC, allocates limited repertory of 135commands, with CPIR = 3,0 circles (tR) per command. The frequencyof operation of processor RISC is: fc = 1/tc = 3,0 GHz. Because ofthe relatively smaller total of commands processor RISC leads toincrease of medium length of program at 230%, (in crowd ofexecutable commands, concerning corresponding program of processorCISC). Compare the output of this two processors. Which isfaster?

A processor of type CISC has repertory of 582 commands withmedium time of implementation of command CPIC = 8,0 circles (tc)per command. The frequency of operation (fc = 1/tc) are 1,5 GHz. Asecond processor, type RISC, allocates limited repertory of 135commands, with CPIR = 3,0 circles (tR) per command. The frequencyof operation of processor RISC is: fc = 1/tc = 3,0 GHz. Because ofthe relatively smaller total of commands processor RISC leads toincrease of medium length of program at 230%, (in crowd ofexecutable commands, concerning corresponding program of processorCISC). Compare the output of this two processors. Which isfaster?

Explanation / Answer

Dear User,        Given data:           Aprocessor of type CISC has repertory of 582 commands           Clockcycles per instruction = 8.0          Clock cycletime = 1/1.5* 10^9         CISC processor time= 582 * 8.0 * (1/1.5*10^9)                                         = 582*8.0*6.667*10^9                                         = 3.1* 10^-6                                         = 3.1msec           Aprocessor RISC allocates limited repertory of 135commands             Clock cycles per instruction = 3.0                Clockcycle time = 1/(3*10^9)             RISC processor time = 135 * 3.0 *3.334*10^-10                                              = 1.35 * 10^-7                                                                                              = 0.135 msec          The RISCprocessor is faster than CISC    

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