某同步总线的时钟频率为100MHz，宽度为32位，地址/数据线复用，每传输一个地址或者数据占有一个时钟周期。若该总线支持burst(猝发)传输方式，则一次“主存写”总线事务传输一个数组intbuf[4]所需要的时间至少是______ns
- A.20
- B.40
- C.50
- D.80
正确答案及解析
正确答案
解析
本题考查计算机组成基础知识。计算机总线按功能和规范可分为数据总线、地址总线、控制总线等，有的系统中，数据总线和地址总线是复用的，即总线在某些时刻出现的信号表示数据而另一些时刻表示地址。总线的数据传输类型分单周期方式和猝发(burst)方式。单周期方式是指一个总线周期只传送一个数据。猝发(burst)方式是指取得总线控制权后进行多个数据的传输。寻址时给出目的地首地址，访问第一个数据，数据2、3到数据n的地址在首地址基础上按一定规则自动寻址(如自动加1)。某同步总线的宽度为32位，int buf[4]数组共有16个字节，128位数据，传输128位数据需要128/32=4个时钟周期，由于采用burst方式，共需要5个时钟周期，在时钟频率为100MHz的情况下，即每个周期10ns，所需要的时间至少是5×10=50ns。
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