H201Ci-1 访问单个字节经常需要读取
访问单个字节经常需要读取或写入整个总线宽度(a单词)立刻。在这些情况下,甚至可以不实现地址总线的最低有效位,而是由控制设备负责从所传输的完整字中分离出所需的单个字节。例如,对于VESA本地总线缺少两个最低有效位,将该总线限制为与…结盟32位传输。
历史上,也有一些计算机只能寻址单词的例子-文字机器。
存储器总线
这存储器总线这辆公共汽车连接到主存储器到存储控制器在计算机系统。最初,通用公共汽车像VMEbus和S-100总线但是为了减少潜伏现代存储器总线被设计成直接连接到DRAM芯片,因此是由芯片标准团体设计的,例如JEDEC。例子是各代同步动态随机存取记忆体(Synchronous Dynamic random access memory)和串行点对点总线,如SLDRAM和RDRAM。一个例外是全缓冲DIMM尽管经过精心设计以最小化这种影响,但还是因其较高的延迟而受到批评。
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