英文:
how this example in computer architecture is possible for main memory?
问题
以下是翻译好的内容：
我阅读我的笔记如下：
我的问题是如何可能有(2^14)-1个字？它是如何计算的？
我们有2^16个可寻址单元，除以2^1（1字节或8位）得到2^15，而不是2^14。我的错误在哪里？
英文:
I read my notes as follows:
My challenge is how it's possible that we have (2^14)-1 words? how it was calculated?
We have 2^16 addressable unit divide by 2^1 (1 byte or 8 bit) makes 2^15 not 2^14. where is my mistake?
答案1
得分: 1
地址单元是字节。使用16位寻址，有2^16个字节。32位字是4字节，所以2^16 / 4（或2^2）= 2^14。
这假设字的寻址必须是字对齐的。如果字可以是字节对齐的，那么字可以重叠，每个字都从每个字节开始（除了内存的顶部）。不过这不是正常情况。
英文:
The addressable units are bytes. With 16 bit addressing, that's 2^16 of them. 32 bit words are 4 bytes, so 2^16 / 4 (or 2^2) = 2^14.
That's assuming the addressing of words must be word-aligned. If words can be byte aligned, words can overlap, with one word starting at each byte (except the top or memory). That's not the normal case though.
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