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今天看到一題如下,請問要如何計算? If the computer has 32 data registers (R0 to R31), 2000 words in memory, and 16 different instructions. What is the minimum size of an add instruction in bits if a typical instruction use the following format: add R0 R2 (A) 14 (B) 13 (C) 28 (D) 29 答案是給A 請問是如何得出的? 感謝各位! -- ※ 發信站: 批踢踢實業坊(ptt.cc), 來自: 114.36.233.66 ※ 文章網址: https://www.ptt.cc/bbs/Grad-ProbAsk/M.1555733064.A.511.html
skyHuan: 16 instrs. => op code要4碼 04/20 12:14
skyHuan: 32 regs => rs/rt要5碼 04/20 12:14
skyHuan: 所以此type的指令需要4+5+5=14碼 04/20 12:14