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Ch2 I/O 運作方式
第 8 題／共 23 題
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8. DMA、Memory-Mapped I/O、Interrupt
#OS-02-008
中
DMA
Memory-Mapped I/O
Interrupt
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☆
Considering both DMA(direct memory access) and I/O, which of the following statements are true?
A
(a) If a machine cannot handle interrupt, the system will not be able to perform I/O via DMA.
B
(b) By using memory-mapped I/O, CPU employs DMA to release the requirements of keeping busy in I/O movement.
C
(c) DMA is an I/O processor, which can accept I/O requests from CPU and acts as a slave device on a bus.
D
(d) The primary problem that DMA will create with a cache memory system is because DMA uses physical addresses whereas CPU caches may use virtual addresses.
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