某32位计算机Cache容量16KB，Cache块大小16Byte，假设主存与Cache地址映像采用直接映像方式，则主存地址为1234E8F8(十六进制）的单元，装入Cache的地址是()。
- A.00010001001101
- B.01000100011010
- C.10100011111000
- D.11010011101000
正确答案及解析
正确答案
解析
由题意，cache块大小为16B，也即主存和cache都要分割成16B的块，块内偏移占4位低地址，cache容量16KB，共16KB/16B=1024个块，因此块地址占10位，计算机是32位，因此还剩余32-10-4=18位作为高地址，即主存分区号，那么该地址结构为：18位分区号，10位块号，4位块内偏移；题中采用直接映射，只有每个区块号相同的才能命中，题目考察的是装入cache的地址，那么就是取低14位，无需分区号，将1234E8F8展开为二进制取低14位即可。
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