题目内容

Comparing with programmed I/O, interrupt-driven I/O further raises the usage rate of CPU operations, because __________

A. it isn’t necessary for CPU to save and restore scene
B. it isn’t necessary for CPU to intervene the dada transfer
C. it isn’t necessary for CPU to read and check status repeatedly
D. both A and B

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In DMA, when does DMA module issue interrupt request signal to CPU?

A. before DMA module transfers a block data
B. after DMA module finishes a block data transfer
C. before DMA module seizes to use bus
D. after DMA module ends to seize bus

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The address of the top of stack is stored in register.

A. PC
B. AC
C. SP
D. PSW

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The interrupt request signal is send fromto.

A. CPU,I/O module
B. I/O module,CPU
CPU,memory
D. memory,CPU

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下面的（）适合构造一个稠密图G的最小生成树。

A. Prim算法
B. Kruskal算法
C. Floyd算法
Dijkstra

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Comparing with programmed I/O, interrupt-driven I/O further raises the usage rate of CPU operations, because __________

A. it isn’t necessary for CPU to save and restore scene B. it isn’t necessary for CPU to intervene the dada transfer C. it isn’t necessary for CPU to read and check status repeatedly D. both A and B

In DMA, when does DMA module issue interrupt request signal to CPU?

The address of the top of stack is stored in register.

The interrupt request signal is send fromto.

下面的（ ）适合构造一个稠密图G的最小生成树。

A. it isn’t necessary for CPU to save and restore scene
B. it isn’t necessary for CPU to intervene the dada transfer
C. it isn’t necessary for CPU to read and check status repeatedly
D. both A and B

下面的（）适合构造一个稠密图G的最小生成树。