Q 1 Consider a dynamic RAM that must be given a refresh cycle 1 2 8 times per ms Each refresh operation requires 2 0 0 ns a memory cycle requires 2 5 0 ns What percentage of the memory's total operating time must be given to refreshes Q 2 Consider a memory system that uses a 3 2 bit address to address at the byte level, plus a cache that uses a 6 4 byte line size Assume a direct mapped cache with a tag field in the address of 2 0 bits Show the address format and determine the following parameters a Number of addressable units b Number of blocks in main memory c Number of lines in cache d Size of tag Q 3 A two way set associative cache consist of 1 2 8 lines, or slot, divided into several sets The main memory contains 8 K blocks of 2 5 6 words each Show the format of main memory addresses Q 4 What is the difference between multitasking and multiprogramming Q 5 Consider a 6 drive, 1 5 0 GB per drive RAID array What is the available data storage capacity for each of the RAID levels 0 , 1 , 2 , 3 , 4 , 5 and 6

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Question: Q 1 - Consider a dynamic RAM that must be given a refresh cycle 1 2 8 times per ms . Each refresh operation requires

1 -

Consider a dynamic RAM that must be given a refresh cycle

128

times per ms

.

Each refresh operation requires

200

ns; a memory cycle requires

250

.

What percentage of the memory's total operating time must be given to refreshes?

2 -

Consider a memory system that uses a

32 -

bit address to address at the byte level, plus a cache that uses a

64 -

byte line size. Assume a direct mapped cache with a tag field in the address of

20

bits. Show the address format and determine the following parameters:

.

Number of addressable units

.

Number of blocks in main memory

.

Number of lines in cache

.

Size of tag

3 -

A two

-

way set

-

associative cache consist of

128

lines, or slot, divided into several sets. The main memory contains

8

K blocks of

256

words each. Show the format of main memory addresses.

4 -

What is the difference between multitasking and multiprogramming?

5 -

Consider a

6 -

drive,

150

-

per

-

drive RAID array. What is the available data storage capacity for each of the RAID levels

0, 1, 2, 3, 4, 5

and

6 ?

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