Lovely Professional University 2010 B.Tech Computer Science and Engineering Assignment -1 Computer System and Architecture - Question Paper

TBA 1

Course No. CSE 261 Course Title: Computer Organization and Architecture

Note: Students are to attempt all assignment questions and test may be from three similar problems but may be with slightly different logic and different data sets

PART-A

Q1. Enable bit plays an important role in decoder expansions. How is this justified in designing?

(a)    3X8 line decoder using two 2X4 line decoders

(b)   5X32 line decoder using four 3X8 and one 2X4 line decoders

Q2. How can a JK flip flop be converted to

(a)    T Flip Flop

(b)   D Flip Flop

Q3. Identify at least two application areas (discuss their roles also) for

(a)    Encoder/Decoder

(b)   Multiplexers/Demultiplexer

(c)    Flip Flops

Q4. Discuss the basic logic behind counters i.e. how will you obtain 1000(8) from 0111(7)? How will you implement the same? How many flip flops will be complemented in a 10 bit binary counter to reach the next count after 1001100111?

PART-B

Q5.What will happen if buffer gate in the clock input of the register is removed? What is the role of clear and load signals in designing register with parallel load?

Q6. The content of a four bit register is initially 1101. The register is shifted six times to the right with the serial input being 101101. What is the content of the register after each shift?

Q7. Draw the block diagram to implement following register transfer statement

yT₂: R2←R1, R1←R2

Q8. A digital computer has a common bus system for 16 registers of 32 bit each. The bus is constructed with multiplexers.

(a)    How many selection inputs are there in each multiplexer?

(b)   What sizes of multiplexers are needed?

(c)    How many multiplexers are there in the bus?