某计算机数据总线为32位，地址空间从F0000000H到F007FFFFH映射为FLASH空间，若要实现FLASH的最大存储容量，至少需要______片16K×16bit的FLASH芯片。
- A.8
- B.16
- C.32
- D.64
正确答案及解析
正确答案
解析
数据总线用于传送数据信息。数据总线是双向三态形式的总线，即它既可以把CPU的数据传送到存储器或输入输出接口等其他部件，也可以将其他部件的数据传送到CPU。数据总线的位数是微型计算机的一个重要指标，通常与微处理的字长相一致。地址总线是专门用来传送地址的，由于地址只能从CPU传向外部存储器或I/O端口，所以地址总线总是单向三态的，这与数据总线不同。地址总线的位数决定了CPU可直接寻址的内存空间大小。一般来说，若地址总线为n位，则可寻址空间为2n位。地址总线的宽度，随可寻址的内存大小而变，决定有多少的内存可以被存取。若要实现FLASH的最大存储容量，则用FLASH芯片布满整个FLASH空间，FLASH空间从F0000000H到F007FFFFH，容量为F007FFFFH-F0000000H+1=80000H，即512K，并且计算机的数据总线为32位，而每一片FLASH芯片的容量为16K×16bit，则至少需要512K/16K×2=64片。
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