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13. a) Distinguish between synchronous and asynchronous DRAMs (4) b) Explain the
important Data transfer signals on the PCI bus. (5)

14. a) Describe the different types of ROMs. (4)

b) Explain the procedure and the packets used for an output transfer in USB interface.
(5)

PART E

Answer any four questions. Each carries 10 marks.

15. Describe processor organization with diagram using a) scratchpad memory b) Two port
memory. (10)

16. Design a 4bit Arithmetic unit which performs the following operations on two inputs A and
8, controlled by selection variables 51 and so and input carry Cin: (10)

81 So Cin = 0 വടി
F=A+1
F=A+B+1
F=A+B’+1
=A
17. a) Write notes on status register. (5)
b) Distinguish between horizontal and vertical microinstructions. (5)

18. What is the significance of a micro program sequencer? Explain its working with the help of
a diagram.

19. Explain micro programmed CPU organization with the help of a diagram.

20. With the help of a block diagram, describe a complete processor unit with all components
and appropriate control variables. Show with an example, how a control word for the
processor can be defined.

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