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编址和编址单位
2022-06-23 04:16:00 【Irene_wyn】
最近在学习计算机组成原理,对于编址、寻址、编址单位等等概念一直比较模糊。以下是我个人对于编址和编址单位的一些简单理解,不知道有没有理解错误,欢迎各位在评论区指正。
编址
为了方便我们存取存储器中的信息,我们需要给每个存储单元编号,即编址。
编址后,CPU即可通过存储单元地址访问它所代表的存储单元,进而在该存储单元中存取信息。
编址单位
编址单位即具有相同地址的那些存储元件(注:存储元件即一个个存储0或1的记忆单元,即1bit)构成的一个单位。
常见说法有:
1.按字节编址:编址单位为一个字节,代表存储体内的一个地址中(每个存储单元中)有一字节的数据。
2.按字编址:编址单位为一个字,代表存储体内的一个地址中(每个存储单元中)有一个字的数据。(例如,该计算机中字长为32位,即一个地址中有32bit的数据 )
如下图所示,该图中为按字节编址,每个存储单元中有8bit。若改为按字编址,字长32bit,则下图中每个单元内为32bit数据。

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