計算機組織與結構 筆記2
Daisy Chain CPU 效能 = 秒數÷程式 = 指令數÷程式 × 平均週期數÷指令 × 秒數÷週期。 MIPS ( Million Instruction Per Second ) EX: Clock-Rate = 200Mhz CPI = 4 Performance ? (MIPS) 1. 1 ÷ 200M = 5ns 2. 5ns × 4 = 20ns ∴ 1 ÷ 20ns = 50 MIPS CPU time = Clock cycle time × CPI × IC (Instruction Count) Clock cycle = 1 ÷ Clock Rate CPU time = ( CPI × IC ) ÷ Clock Rate CPU I/O 定址 1. Memory mapped