存储、中断、总线及输入输出系统

存储系统的基本要求：

大容量，高速度和低价格。

访问时间：

存储器从接到访存读申请，到信息被读到数据总线上所用的时间

存储周期：

连续启动一个存储体所需的时间间隔

频宽：

每秒传输的信息位数

并行主存系统：

能并行读取多个CPU字的单体多字、多体单字或多体多字的交出存储主存系统

并行主存频宽：

主存频宽与分体数m、转移概率λ的关系 

中断分类：

• 机器校验中断
• 访管中断
• 程序性中断
• 外部中断
• I/O中断
• 重新启动中断

总线：

总线是用于互连计算机、CPU、存储器、I/O端口及外部设备、远程通信设备间信息传送通路的集合。

总线控制方式：

• 串行连接
• 定时查询
• 独立请求

输入输出系统：

包括输入输出设备、设备控制器及与输入输出有关的软硬件。

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