Which one of the following facilitates transfer of bulk data from hard disk to main memory with the highest throughput?
DMA based I/O transfer
Interrupt driven I/O transfer
Polling based I/O transfer
Programmed I/O transfer
Question 1 Explanation:
Consider a computer system with DMA support. The DMA module is transferring one 8-bit character in one CPU cycle from a device to memory through cycle stealing at regular intervals. Consider a 2 MHz processor. If 0.5% processor cycles are used for DMA, the data transfer rate of the device is __________ bits per second.
Question 2 Explanation:
Of the following, which best characterizes computers that use memory-mapped I/O?
The computer provides special instructions for manipulating I/O ports
I/O ports are placed at addresses on the bus and are accessed just like other memory locations
To perform I/O operations. it is sufficient to place the data in an address register and call channel to perform the operation
I/O can be performed only when memory management hardware is turned on
Question 3 Explanation:
The size of the data count register of a DMA controller is 16 bits.The processor needs to transfer a file of 29,154 kilobytes from disk to main memory.The memory is byte addressable. The minimum number of times the DMA control lerneeds to get the control of the systembus from the processor to transfer the file from the disk to main memory is ____.
Question 4 Explanation:
A processor is fetching instructions at the rate of 1 MIPS. A DMA module is used to transfer characters to RAM from a device transmitting at 9600 bps. How much time will the processor be slowed down due to DMA activity?
Question 5 Explanation:
There are 5 questions to complete.