JNTU
JNTU B.Tech II Year COMPUTER ORGANIZATION AND ARCHITECTURE Previous Question Paper (September - 2021 - R18)
Answer any five questions. All questions carry equal marks.
Main
Draw the block diagram of a digital computer and explain the purpose of each part.
Answer
- Central Processing Unit (CPU): The brain of the computer, comprising the Arithmetic Logic Unit (ALU) for performing calculations and logical operations, and the Control Unit (CU) which directs the flow of data and instructions.
- Memory Unit: Stores data and instructions required for processing. It is divided into primary memory (RAM/ROM) for fast access and secondary storage for long-term retention.
- Input Unit: Converts external data and commands into binary signals that the computer can process (e.g., keyboard, mouse).
- Output Unit: Translates processed binary data back into human-readable formats (e.g., monitors, printers).
- System Bus: The communication pathway consisting of the Data Bus, Address Bus, and Control Bus, which interconnects all components to facilitate data transfer.
Design a 4-bit combinational circuit decrementer using four full-adder circuits.
Answer
Using four full adders (FA) connected in a ripple-carry configuration:
- The input bits A0, A1, A2, A3 are connected to the first input of each respective full adder.
- The second input of every full adder is tied to logic 1 (since 1111 is added).
- The Carry-In (Cin) of the first full adder (FA0) is set to 0.
- The Carry-Out (Cout) of each FA is connected to the Carry-In of the next FA.
- The outputs S0, S1, S2, S3 represent the decremented value.
What are the common fields found in instruction format? Explain various instruction formats based on types of CPU Organization?
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Perform the arithmetic operation (+41)+(-13) and (-41)-(-13) in binary using signed 2’s complement representation for negative numbers.
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Draw the block diagram of a typical DMA controller and explain.
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Explain Daisy-Chain priority interrupt in detail.
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Construct a diagram for a 4×4 omega Switching network. Show the switch setting required to connect input 3 to output 1.
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Give a brief note on mutual exclusion with a semaphore.
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Differentiate between computer organization and computer architecture.
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Explain the Stored Program organization in detail.
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Explain the microprogram sequencer for a control memory with a neat diagram.
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Derive an algorithm in flowchart form for adding and subtracting two fixed point binary numbers when negative numbers are in the signed-2’s complement representation.
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