Lecture 2: Machine Organization 2

Question 1

What is M[x]?

Answer 1

Denotes contents of memory at address, x

Question 2

What is D[x]?

Answer 2

Denotes content of disk at address, x

Question 3

What is Ri?

Answer 3

Denotes content of program counter

Question 4

What is →?

Answer 4

Denotes assignment

Question 5

MAR

Answer 5

Memory Address Register

Question 6

MDR

Answer 6

Memory Data Register

Question 7

CMD

Answer 7

Command Register

Question 8

The Memory Address Register (MAR) does…

Answer 8

Stores memory address from which data will be fetched or to which data will be stored

Question 9

The Memory Data Register (MAR) does…

Answer 9

Stores data being transferred to and from memory location specified by MAR. It is two-way register:

Question 10

The Command Register (CMD) does…

Answer 10

Indicates if data will be read /written

Question 11

Main Memory:

Answer 11

Only large storage media that CPU can access directly (volatile)

Question 12

Secondary Storage:

Answer 12

Extension of main memory that provides large, nonvolatile storage capacity

Question 13

Caching:

Answer 13

Use of high-speed memory to hold recently accessed data