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Digital System Design All Questions and Answers

  1. Define digital systems. Why digital system is superior to analog system?
  2. Narrate the following characteristics of IC digital logic families: i) Noise margin ii) Propagation delay
  3. Design a loc circuit that has three inputs A, B, C and whose output will be HIGH only when a majority of inputs are HIGH.
  4. Show a Full Adder can be converted to a Full Subtractor with the addition of one inverter circuit.
  5. What do you mean by micro operations? Write different categories of microoperations in digital system.
  6. What do you mean by overflow?
  7. Draw the memory unit that communicates with multiple registers.
  8. What is scratchpad memory? Draw the processor unit which employing scratchpad memory.
  9. Define a binary parallel adder.
  10. What do you mean by memory organization? Write the main physical differences between the following memory technologies: i) SRAM ii) DRAM
  11. Design a combinational circuit using a ROM. The circuit accepts a 3 bit number and generates an output binary number equal to the square of the input number.
  12. What is ALU? Explain the operation of a 4 bit arithmetic circuit.
  13. Draw the block diagram of a processor unit and explain its working principle.
  14. Design a BCD to excess 3 code converter.
  1. What do you mean by carry propagation delay? How it can be reduced?
  2. Define Multiplexer. Implement a full adder with Multiplexers.
  1. What is an accumulator register? Draw the processor unit which employing an accumulator register.
  2. Write the operation of ALU with status register.
  3. Draw the flowchart and equipment configuration of a hardware controlled adder/subtraction circuit.
  1. With block diagram briefly explain the design of a digital computer.
  2. What is DTL? Describe the basic operation of DTL NAND gate with necessary circuit diagram.
  1. Draw the flowchart for counting the number of 1’s in register R1.
  2. What are the difference and similarities you have found between “Digital Logic Design” and “Digital System Design”?
  3. Differentiate between Register and Counter? Briefly describe the types of data those can be stored in a register.
  4. Can every counter be a register? Describe the fact with an example.
  5. Describe the hardware implementation of a simple computer on the basis of RTL.
  6. Sketch the implementation of a simplest logic circuit or a processor.
  7. Design a 4-bit combinational logic shifter.
  8. Define flowchart and timing diagram. How does the control Unit maintain the processor functionalities? Explain.
  9. How a processing unit is connected with a control unit? What types of input a control unit may have?
  10. What advantages a PCI bus exhibits over ISA bus?
  1. Describe the types of memory with proper example, on the basis of the ways data is read from or written into it.
  2. Define Diode and Transistor. Explain, how the characteristics of a diode can be obtained from a transistor?
  3. Sketch and explain how a basic Inverter and a NAND gate can be implemented using CMOS logic.
  4. Define the term system. Explain the basic criteria a digital system should contain.
  5. Explain the basic components for describing a digital system.
  6. Write the importance and role of control function on various operations performed in a digital system.
  7. Define “Instruction Fetch Cycle”. Briefly describe with proper example, the types of data that an MBR can hold.
  8. Define Bit-slice microprocessor? Show the bus organization for four processor registers connected with processor through common buses.
  9. Define the term “Design Algorithm”. Explain the methods used for designing a control unit for a computer.
  10. What are the control word and control memory mean? Explain the microprogram control mechanism of a control unit with necessary diagram.
  1. Write some differences between SRAM and DRAM.
  2. Briefly explain the steps that should be followed to implement a hard-wired control unit.
  3. Sketch and describe the circuit diagram of a DRAM. Also explain, why DRAM is needed to be refreshed?
  4. Define IC and IC logic family. Describe the characteristics of IC those measure its performance.
  5. Mention some difference between Analog and Digital System
  6. Implement a NAND gate with only NOR gates.
  7. What is excess-3 code? Design a BCD to excess-3 code converter.
  8. What is binary parallel adder? Why is it called Parallel?
  9. Sketch the block diagram of a BCD adder. Explain why two Binary parallel adders are needed to construct a BCD adder.
  10. Define Sequential logic circuit. Mention some differences between synchronous and asynchronous sequential circuits.
  11. Draw the logic diagram of clocked JK flip flop and describe how does it solves the indeterminate conditions of the clocked RS flip flop
  12. Show the state table, state diagram and characteristics equation of clocked T flip flop with its logic diagram.
  13. Sketch and explain how a basic AND gate can be implemented using TTL.
  14. Define register and counter in terms of Flip-flop. Write some differences between Register and Counter.
  15. Show the implementation of a 4×4 Integrated memory Using RAM cell
  16. Design a four bit Binary Ripple counter with JK flip flop.
  17. Explain the reason, why is it possible to have more capacity in a ROM then in a RAM with same chip size.
  18. What is meant by Micro operation? Briefly describe the types of micro operation performed on the information stored in computer registers.
  19. Define processor and CPU. Explain the importance of registers for a processor in a digital system.
  20. What is accumulator register? Describe its importance in a digital system.
  1. Write the importance of Control Unit in digital Computer.
  2. Explain the One flip-flop per state design method of control unit. How is this method similar to a Ring counter?
  3. Describe the procedure of sign -magnitude addition and subtraction with necessary flowchart.
  4. Discuss the concept of Control word, Control memory and Microprogramming.
  5. Define Diode and Transistor. Explain, how the characteristics of a diode can be obtained from a transistor.
  6. Write short note on VESA and PCI bus.
  7. Sketch the circuit diagram of a static RAM cell and describe how data is stored inside it.
  8. Compare the characteristics of the following digital logic families: i) MOS vs CMOS ii) TTL vs RTL iii) TTL vs CMOS
  9. What do you mean by digital system? Discuss the characteristics of digital system.
  10. Explain why binary digits are used to code data to be stored in computers?
  11. Describe the basic operation of a TTL OR gate with necessary circuit diagram.
  12. Why CMOS is is better than TTL? Write the basic benefits of ECL.
  13. Design a NAND gate using CMOS technology.
  14. What do you mean by memory organization? Write the main physical differences between the following memory technologies: i) SRAM ii) DRAM
  15. How can you design a SRAM subsystem? Explain
  16. Show the basic block diagram of a DRAM. Explain.
  17. Draw the block diagram of a processor unit and explain its working principle.
  18. What do you mean by control word and microinstruction? Write the control word format of the following microinstructions: i) R2 ß R2 – R3 ii)R1 ß sh1 R2 iii) R7 ß Input
  19. Define combinational logic circuits. What are the design procedures of combinational logic circuits?
  20. How many don’t care inputs are there in a BCD adder?
  1. Express the Boolean Function F = A + B’C in a sum of minterms.
  2. How many different sets of input conditions will produce a High output from a three input OR gate?
  3. What do you mean by carry propagation delay? How it can be reduced?
  4. Draw the logic diagram of a 4 x 16 decoder constructed with the 3 x 8 decoders.
  5. Show a full adder can be converted to a full subtructor with the addition of one inverter circuit.
  6. Define scratchpad memory? Explain a processor unit employing a scratchpad memory.
  7. Design a arithmetic unit of a computer system.
  8. Design a combinational circuit using a ROM. The circuit accepts a 3 bit number and generates an output binary number equal to the square of the input number.
  9. Write the steps of execute an instruction by the CPU
  10. Draw the flowchart and control state diagram of a hardware controlled adder/subtraction circuit.
  1. Show a microprocessor and microcontroller based system.
  2. Write down the advantages of MOS digital integrated circuits over TTL and ECL.
  3. What do you mean by a code? How many bits per character does ASCII code use?
  4. Define combinational logic circuits. What are the design procedures of combinational logic circuits?
  5. What are the limitations of K – map method?
  6. Design an adder circuit to add three binary digits with necessary table and circuit diagram and explain.
  7. Draw the block diagram of a processor unit and briefly describe its each field.
  8. What is the difference between hardwired control and micro program control?
  9. Define algorithm and flowchart. Draw the flowchart for sign magnitude addition and subtraction.
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