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CS501 Advance Computer Architecture Assignment 4 Solution Spring 2014

Scenarios discussion:

What will be the order of “Interrupt Driven”, “DMA” and “Polling” if these two scenarios occur?

  1. 1.      Lowest impact on processor utilization to a single I/O device.

Ans#

If we want to be a lowest impact on Processor utilization to a single I/O device the order wil be as follows

  • Polling
  • Direct Memory Access
  • Interrupt Driven.
  1. 2.      Lowest impact on processor utilization from a single I/O device.

Ans#

In case of Lowest Impact on Processor utilizer from a single I/O device the order will be as follows.

  • Direct Memory Access
  • Interrupt Driven.

Question 2:                                                                                   10 Marks

Record the integer according to the Booth Procedure

Integer = 781

Note:  -1 equals to bar 1

Integer = 781

781= 01100001101

512 + 256 + 8 + 4 + 1

Both recorded number

=10 -100010 -11 -1

=1024 – 256 + 16 – 4 + 2 – 1

=781

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