Spring 1990-quiz1 - Computer Science 252 Quiz#1 Name 1 The...

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1 Quiz #1 S90 No Answers 9 / 2 4 / 9 4 Computer Science 252 Quiz #1 Name:_________________ 1. The cost/performance of two microprocessors is to be examined, each running the same instruction set. The first option is a Galium Arsenide (GaAs) microprocessor. A GaAs wafer that is 10 cm ( 4 inches) in diameter costs $1000. The manufacturing process creates 4 defects per square centimeter. The microprocessor fabricated in this technology is expect to have a clock cycle rate of 250 MHz, with an average clock cycles per instruction of 1.5 if we assume an infinitely fast memory system. The size of the GaAs microprocessor is 1.0 cm by 1.0 cm. (Assume α is 2.0 for GaAs.) The second option is a CMOS microprocessor. A 15 cm ( 6 inch) wafer with 2 defects per square centimeter costs $500. The 1.0 cm by 2.0 cm microprocessor executes multiple instructions per clock cycle to achieve an average clock cycles per instruction of 0.75, assuming an infinitely fast memory while achieving a clock rate of 50 MHz. (The microprocessor is larger because of on chip caches and executing multiple instructions per clock cycle.) You found that a memory system can be built for either microprocessor, and that the average extra time for memory accesses per instruction (for instructions and data) is the same for each microprocessor: 10 ns.
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