JNTU
JNTU B.Tech II DIGITAL LOGIC DESIGN AND COMPUTER ORGANIZATION Previous Question Paper (August/ September - 2022 - R15)
Answer Any Five Questions. All Questions Carry Equal Marks.
Main
Explain the functions and organization of address bus, data bus and control bus in a digital computer system.
Answer
The system bus is the primary communication pathway in a computer, consisting of three distinct functional groups:
- Address Bus: This is a unidirectional bus used by the CPU to specify the physical address of the memory location or I/O port to be accessed. The width of the address bus determines the maximum addressable memory capacity of the system (e.g., n bits allow addressing 2n locations).
- Data Bus: This is a bidirectional bus that carries the actual data or instructions between the CPU, memory, and I/O devices. Its width, typically matching the word size of the processor, determines the amount of data that can be transferred in a single clock cycle.
- Control Bus: This set of lines manages the coordination and synchronization of all system activities. It carries control signals such as Read/Write commands, interrupt requests, bus requests, and clock signals to ensure that data and address transfers occur correctly without conflict.
Represent the decimal number 46.5 as a floating-point number with 16-bit mantissa and 8 bits exponent.
Answer
To represent 46.5 in floating-point format:
- Binary Conversion: 46 in binary is 101110. 0.5 in binary is 0.1. Thus, 46.5 = 101110.1.
- Normalization: Shift the binary point to the left to get 0.1011101 × 26. The mantissa is 1011101 and the exponent is 6.
- Mantissa (16-bit): Pad the mantissa with zeros to reach 16 bits: 1011101000000000.
- Exponent (8-bit): 6 in binary is 00000110.
Final representation: Mantissa
Perform the decimal subtraction in 8-4-2-1 BCD using 9’s complement. i) Subtract 79 from 26 ii) Subtract 748 from 983.
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i) Convert 110001.1010010 into hexadecimal. ii) Convert (423.25)10 into octal.
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Obtain the simplified expression in product of sums. i) F(A,B,C,D) = π(0,1,2,3,4,10,11) ii) F(A,B,C,D) = π(1,3,5,7,13,15)
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Design a combinational circuit which converts BCD to Excess-3 code.
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Convert SR flip-flop into JK flip-flop.
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Design a 3-bit magnitude comparator.
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Evaluate the following arithmetic statement using zero, one, two and three address instructions. Use the conventional symbols and instructions. X = (A+B) * (C+D).
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Show the hardware to be used for the addition and subtraction of two decimal numbers in signed-magnitude representation. Indicate how an overflow is detected.
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Explain any 5 instructions of IA-32 with examples.
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Derive an algorithm in flowchart form for the non-restoring method of fixed-point binary division.
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Distinguish between the virtual memory and cache memory. Write the merits and demerits of virtual memory.
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Give a brief note on instruction cycle.
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Compare interrupt driven data transfer scheme with DMA. Using block diagram, explain interrupt driven transfer scheme.
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What are the differences between subroutine and interrupt service routine?
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