Question

Each of the following questions is either True or False. Place a T (True) if the answer is True on the answer sheet beside the question; otherwise place a F (False) if the answer is False on the answer sheet beside the question.

21. Variable-length instructions are easier to decode than fixed-length instructions.

      T                                        F

22. Fixed-length instructions always have the same number of operands.

      T                                        F

23. The two types of cache write policies are write-through and write-back.

      T                                        F

24. When a computer uses paging, there must be a page table for every process.

      T                                        F

25. If we have a byte-addressable computer using direct mapping with 16-bit main

      memory addresses and 32 blocks of cache, and each block contains 8 bytes, the size

      of the tag field is 8.

      T                                        F

            

26. If cache access time is 10 nanoseconds, main memory access time is 200

      nanoseconds, and the cache hit rate is 90%, the average access time for the processor

      to access an item, assuming parallel (overlapped) access, is 29 nanoseconds.

      T                                        F

27. In a direct-mapped cache, if there is contention for a cache block, the only possible

      action is replacement of the existing block.

      T                                        F

28. Memory organization has no effect on instruction format.

       T                                       F

29. A unified cache is a cache that holds both data and instructions.

      T                                        F

30. Accumulator architectures store one operand on the stack and the other in the

      accumulator.

     T                                        F

Answer 1

21)

   Variable-length instructions are difficult to decode than fixed-length instructions.

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22)

Fixed-length instructions always doesnt have the same number of operands.

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23)

write through and write back are the two cache-write policies.

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24)

every process has its own pagetables.

Answer 2

21)

   Variable-length instructions are difficult to decode than fixed-length instructions.

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22)

Fixed-length instructions always doesnt have the same number of operands.

=================================================

23)

write through and write back are the two cache-write policies.

==============================================

24)

every process has its own pagetables.