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ab503044120 avatar ab503044120 commented on June 9, 2024

看图1-4

111111

from computer-basics.

fengbianyun avatar fengbianyun commented on June 9, 2024

看图1-4

111111
要是直接通过IO总线和CPU中的寄存器打交道,为什么还会出现IO速度慢?

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ab503044120 avatar ab503044120 commented on June 9, 2024

你是说的,高速缓存那一章吗,他是说的主存速度远低于cpu寄存器速度,并没有说io设备速度慢

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JessonYue avatar JessonYue commented on June 9, 2024

这里书籍上讲的原理是 :计算机原理中的I/O 数据访问。IO设备设备是什么?网卡、存储设备、人机交互设备设备等等。那么这里也会有很多的I/O接口,比如SCSI、串口、并口等等。这里会有I/O数据交互的方式:监控I/O方式,DMA方式等。CPU里面的寄存器就是一个逻辑上的接口,所以可以理解成为主存储器我们绕过了,直接读取寄存器了。学术上的概念可以Google I/O 数据传输。

from computer-basics.

fengbianyun avatar fengbianyun commented on June 9, 2024

这里书籍上讲的原理是 :计算机原理中的I/O 数据访问。IO设备设备是什么?网卡、存储设备、人机交互设备设备等等。那么这里也会有很多的I/O接口,比如SCSI、串口、并口等等。这里会有I/O数据交互的方式:监控I/O方式,DMA方式等。CPU里面的寄存器就是一个逻辑上的接口,所以可以理解成为主存储器我们绕过了,直接读取寄存器了。学术上的概念可以Google I/O 数据传输。

谢谢,理解了

from computer-basics.

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