Deck 14: Shift Registers, Packages, and Combinational Circuits in VHDL

Question 1

Shift registers comprise of which flip-flops?

A)d flip-flops
B)sr flip-flops
C)jk flip-flops
D)t flip-flops

Answer 1

d flip-flops

Question 2

In serial input serial output register, the data of is accessed by the circuit.

A)last flip-flop
B)first flip-flop
C)all flip-flops
D)no flip-flop

Answer 2

first flip-flop

Question 3

In PIPO shift register, parallel data can be taken out by              

A)using the q output of the first flip-flop
B)using the q output of the last flip-flop
C)using the q output of the second flip-flop
D)using the q output of each flip-flop

Answer 3

using the q output of each flip-flop

Question 4

Four bits shift register enables shift control signal in how many clock pulses?

A)two clock pulses
B)three clock pulses
C)four clock pulses
D)five clock pulses

Question 5

Time taken by the shift register to transfer the content is called                

A)clock duration
B)bit duration
C)word duration
D)duration

Question 6

Transfer of one bit of information at a time is called                

A)rotating
B)serial transfer
C)parallel transfer
D)shifting

Question 7

In gated D latch, which of the following is the input symbol?

A)d
B)q
C)en
D)clk

Question 8

Which of the following is true about packages?

A)package is collection of libraries
B)library is collection of packages
C)package is collection of entities
D)entity is collection of packages

Question 9

A package may consist of design units.

A)2
B)3
C)4
D)5

Question 10

Any item declared in a package declaration section are visible to                

A)every design unit
B)package body only
C)library containing that package
D)design unit that use the package

Question 11

Which of the following is not a in-built package in VHDL?

A)std_logic_1164
B)textio
C)standard
D)std

Question 12

Packages increases of the code.

A)reusability
B)readability
C)managing
D)resolution

Question 13

Which of the following can't have multiple assignments or drivers?

A)std_logic
B)integer
C)std_ulogic
D)bit

Question 14

Which of the following is a not a characteristics of combinational circuits?

A)the output of combinational circuit depends on present input
B)there is no use of clock signal in combinational circuits
C)the output of combinational circuit depends on previous output
D)there is no storage element in combinational circuit

Question 15

Which of the following is not a combinational circuit?

A)adder
B)code convertor
C)multiplexer
D)counter