[理工] 100交大OS+計組

看板Grad-ProbAsk作者Transfat (Transfat)時間7年前 (2017/01/14 22:45)推噓3(3推 0噓 24→)

留言27則, 3人參與討論串1/1

[100交大計組] 11(b) Before DMA transfer. DMA controller must notify processor by supplying identity of the device,operation, memory addrss, number of bytes to transfer,etc. 我知道DMA在傳data之前要先去跟CPU問說可不可以傳，我想問這題錯在DMA是都不會去提供這些資訊嗎還是？ [100交大OS] 05. Consider a tiny paging system has 16KB physical memory, and the frame size is 1KB. Let the logical address have 16 bits. The page table uses single-level direct index. Which one of the following is not correct? (c)There are 16 entries in the page table (e)The page table requires 320 bits , including the vaild-invaild bits. 竟然卡住了，這題應該假設page size=frame size去算（吧）,所以page offset=10,page index+tag=16-10=6 frame number=4 bits(因為有16個frame),想問(c)和(e)是？謝大家 -- ※ 發信站: 批踢踢實業坊(ptt.cc), 來自: 140.112.25.105 ※ 文章網址: https://www.ptt.cc/bbs/Grad-ProbAsk/M.1484405114.A.6F7.html

推