3c213vhdl tutorial sheets (2)

8/3/2019 3c213VHDL Tutorial Sheets (2)

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AMITY UNIVERSITY, UTTER PRADESH

AMITY SCHOOL OF SCIENCE AND

TECHNOLOGY

VHDL Tutorial-1

Q.1) Discuss briefly about different types of architecture with

help o an example.

Q.2) Explain Mixed Style of Architecture.

Q.3) What is the difference between package declaration and

package body.


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TECHNOLOGY

VHDL Tutorial-2

Q.1 ) Write the code in 3 different styles Behavioral, Dataflow

& Structural for 2 to 1 Mux.

Q.2) Write down the truth table, entity declaration and behavioral/dataflowarchitecture for the 2-4 decoder.


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TECHNOLOGY

VHDL Tutorial-3

Q. Which of the following are valid VHDL basic identifiers? Of

the invalid identifiers why are they invalid?i. last_item

ii. prev item

iii. value-1

iv. buffer

v. element#5

vi. _control

vii. 93_999

viii. entry_


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AMITY SCHOOL OF SCIENCE ANDTECHNOLOGY

VHDL Tutorial-4

Q.1: Rewrite the following decimal literals as hexadecimal

literals:

(i) 1(ii) 46(iii) 512.0(iv) 0.25

Q.2: What decimal numbers are represented by the following

literals:

(i) 8#4#(ii) 16#2C#(iii) 2#1111_1010#(iv) 2.5e5(v) 2#1#E10(vi) 2#0.101#


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TECHNOLOGY

VHDL Tutorial-5

Q.1: What is the difference between 16 #ABCD# and X ABCD

?

Q.2: Express the following octal and hexadecimal bit string as

binary bit string:

(i) o 777 (iii) O 1_456

(ii) O 346 (iv) X 0000_0001


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TECHNOLOGY

VHDL Tutorial -6

Q1. WAP for a simple Heater Thermostat. The device can be

modelled as an entity with two integer input. One that specifies

the desire temperature and another that is connected to a

Thermometer and one Boolean output that turn a Heater on

and off. The Thermostat turns the Heater on if the measured

temperature falls below two degree less than the desire

temperature and turns the heater off if the measured

temperature rises above two degree greater than the desiretemperature.


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TECHNOLOGY

VHDL Tutorial -7

Q1. Write constant declaration for the number of bit in a 32 bit

word and for the number PI = 3.14159

Q2. Write variable declarations for a counter initialize to 0; a

status flag used to indicate whether a module is busy; and a

standard logic value used to store a temporary result.

Q3. Given the subtype declaration:

subtype pulse_range is time_range 1 millisecond to 100

millisecond

subtype word_index is integer range 31 downto 0

What are the values of left , right , low , high and ascending

attributes of each of these subtypes.

Q4. Given the type declaration:

type state is(off,standby,active1,active2);

What are the values of

state pos (standby)

state succ (active2)

state val (2)


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state pred (active1)

state leftof (off)

state rightof (off)



TECHNOLOGY

VHDL Tutorial -8

Q1. Write a wait statement that suspends the process until the

signal ready changes to 1 or until a maximum of 6 milliseconds

has left.

Q2. Write a wait statement that suspends a process until the

signal has changes from 1 to 0 while an enable signal is 1.

Q3. Write down the difference between signal and a variable.

Q4. Discuss data types and data objects.


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TECHNOLOGY

VHDL Tutorial -9

Q1. WAP for a swapper that has one input and one output part

each of which is a bit_vector of subtype halfword . Declared

subtype halfword is bit_vector(0 to 15) range attribute to

determine the index of the array.

Q2. WAP for n-inputs AND gate.


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TECHNOLOGY

VHDL Tutorial -10

Q1. Difference between Transport delay and Inertial delay ?

Also write their applications?

Q2. WAP to count number of 1s in a given bit vector?

3c213vhdl tutorial sheets (2)

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