QUESTION BANK-VHDL DESIGN & TECHNOLOGY Q1. Discuss the subtypes with examples as are used in VHDL. Q2 What is key difference between sequential and combinational circuits? Q3 Design BCD to Excess-3 code convertor, using minimum number of NAND gates. Q4 Discuss the Physical types with examples as used in VHDL. Q5. Discuss the Difference between array and records types. Q6. What is meant by operator overloading? Give an example. Q7 what is the difference between function and procedure in VHDL? Give suitable examples. Q8 Discuss the use of function as a type conversion function. Q9. Write down the truth table, entity declaration and behavioural/dataflow architecture for the Encoder. Also draw the circuit and output waveforms Q10. Write down the truth table, entity declaration and behavioural/dataflow architecture for the Comparator. Also draw the circuit and output waveforms: Q11. Write down the truth table and VHDL code for the 4-bit left to right shift register. Also draw the circuit and output waveforms. Q12 Write down the truth table and VHDL code for the 4-bit up/down counter. Also draw the circuit and output waveforms Q13 . What are the basic components of a micro computer? Explain briefly. Q14 Describe microcomputer implementation in VHDL. Q15 How can a ROM be used as a PLA') Write down its advantages. Q16 Discuss briefly 22 V /0 PLD. Q17. Write short note on PAL 16L8. Q18 Write short note on Various Loops in VHDL Q19 Write short note on Packages. Q20 What is the difference between variable and signal. Q21 Design a 2 to 4 decoder circuit. Give its entity declaration and structural model and behavioural model. Also draw the waveform giving relation between its inputs and ouputs. Q22 Write short note on difference between if and case statement. Q23 Write short note on Loop statement. Q24 Write short note on Next statement. Q25 Write down truth table, working behavioural / dataflow ·architecture for the Code convertor. Also draw the circuit and output waveform. Q26 Write down truth table, working behavioural / dataflow architecture for the 4-bit comparator. Also draw the circuit and output waveform. Q27 Write down truth table, VHDL Code for the n bit register with parallel load. Also draw the circuit and output waveform. Q28 Write down truth table, VHDL Code for the J-K flip flop using behavioral modeling. Q29 What are basic components of computer. Write down VHDL code for memory subsystem. Q30 Write short note on FPGA. Q31 Differentiate between a process and wait statement. Can they be used simultaneously in a program? Q32 Write down the VHDL code of following: (a)D-flip flop (b) T-flip flop Q33 Write down the VHDL code of S-R flip flop. Q34 What are generics? Q35 Expalin with example that how a component can be made more general using generics. Q36 What are sequential statements? Write down its syntax. Q37 Discuss process and wait statements. Q38 How are sequential statements different from concurrent statements ? Q39 Write a short note on package and library. Q40 Write down the VHDL code for ALU and describe its working. Briefly explain the function of control unit. Q41 Design a BCD-to-excess-3 code converter using PLA and PAL. Q42. Write short notes on Conditional statements. Q43. Write short notes on Case statements. Q44 What are basic components of a computer. Write down the code for memory or input / output subsystem. Q45 Write down the truth table; working of a 16 x 1 multiplexer along with its diagram. Implement 16 x 1 multiplexer in VHDL using case statement. Q46. Write short notes on Arrays and loops. Q47 Write short notes on Structural Modelling. Q48 What is the difference between encoder and multiplexer. Q48 What is the difference between decoder and demultiplexer. Q49 What are steps involved in implementation and anlysis of digital systems. Q50 What are capabilities of VHDL. Q51 Explain the significance of conditional signal assignment statement and selected signal assignment statement. Q52 How will you compare component declaration and component instantiation. Q53 Write down the configuration specification for full adder circuit. Q54 Write short note on subprogram. Q55 What are aliases. Expalin with example. Q56 Design and implement counter using VHDL which counts upto 9 and down counts again from 9 to 0. Q57 Explain resolution functions. Q58How does look-a head carry adder speed up the addition process. Q59 What is parity bit generator. Q60 What are applications of flip flops. Q61What is shift register. Write the VHDL code of Shift register. Q62 Give logic diagram of 4-bit buffer register. Q63 What are different types of ROM,s. Q64 What is the disadvantage of serial adder. For which applications are they preffered. Q65Wgat is difference between counting sequence of an up-counter and down-counter. Q66Design and implement Mod6 counter using T-flip flop. Q67 Design and implement Mod3 counter using J-K-flip flop. Q68What are applications of shift register. Q69 Design and implement 4-bit gray to binary converter. Q70 What are hardware description languages. Q71 Design and implement Mod5 counter using D-flip flop. Q72 Write short note on delta delay. Q73 What are different computer aided tools for digital systems. Q74 What are applications of multiplexers. Q75 Write short note on inertial delay. Q76 What do you mean by latch and gated latch. Q77 How does PLA differ from ROM. Q78 How do you convert one type of flip flop to another Q79 Write short note on transport delay. Q80 Write about behavioral models. Q81How do you convert S_R flip flop to J-K flip flop. Q82 Deign and implement synchronous 3-bit up/down counter using J-K flip flops.
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