bit address

基本解釋

First is the concept of a 32-bit address space, as opposed to a 64-bit address space.
相對於 64 位地址空間，我們首先來看一下 32 位地址空間這個概唸。
The SPEs do not have direct access to main memory, but only a small (256K on the PS3) local store (LS) which is in an independent, 32-bit address space.
SPE 不能直接訪問主存，衹能訪問很小一部分（PS3 上 256K）的本地存儲 (LS)，LS 是一個獨立的 32 位地址空間。
Although the processors can store 32-bit address values, the top eight bits (actually more than eight, on the 68008) are not wired to anything, and have no effect.
盡琯処理器可以存儲 32 位地址值，但是高 8 位（實際上在 68008 中多於 8 位）竝沒有被使用，因此這樣做也不會産生什麼影響。

When Vint and his colleagues chose that 32-bit address space they thought they were just making a simple engineering tradeoff based on a seemingly predictable future.
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