20 Questions
What is the primary purpose of a combinational logic circuit?
To translate data received at its inputs to another digital code
Which of the following is an example of a combinational logic circuit?
Magnitude Comparator
What is the main function of a decoder in combinational logic circuits?
To convert binary information from n input lines to 2𝑛 unique output lines
What is the role of a sequential logic circuit?
To employ memory elements such that the state of each output channel depends on the previous states of the input channel
What is the distinguishing feature of a flip-flop in sequential logic circuits?
It can be either of two states, depending both on the input received and on which state it was in when the input was received
What is the main difference between combinational and sequential circuits?
Combinational circuits do not have memory elements, while sequential circuits do.
Which arithmetic circuit accepts 2 binary bits as inputs and produces sum and carry?
Half-Adder
What does a Full-Subtractor circuit accept as inputs and produce as outputs?
Two binary bits and a difference
Which circuit determines whether there is a borrow-out when accepting 2 inputs?
Half-Subtractor
What is the function of a Binary Parallel Adder circuit?
Adding two binary numbers
What is the primary function of a half-adder circuit in combinational logic?
Accepts two binary bits and produces sum and carry
What distinguishes a full-adder circuit from a half-adder circuit in combinational logic?
Accepts two binary bits and a carry-in, produces sum and carry
What is the main purpose of a half-subtractor circuit in combinational logic?
Accepts two inputs, computes their difference, and determines if there is a borrow-out
What does a full-subtractor circuit accept as inputs and produce as outputs in combinational logic?
Accepts two inputs and a borrow-in, produces their difference and a borrow-out
Which best describes the main function of a binary parallel adder circuit in combinational logic?
A circuit that adds two binary numbers
What is the primary function of a magnitude comparator in combinational logic circuits?
Compares two n bit binary numbers and states the result of the comparison
Which type of sequential logic circuit employs memory elements such that the state of each output channel depends on the previous states of the input channel?
Flip-Flop
What is the distinguishing feature of a shift register in sequential logic circuits?
Is used for storage or transfer of data in the form of binary numbers and then 'shift'
What is the function of a demultiplexer in combinational logic circuits?
Receives information on a single line and transmits it to one of 2𝑛 output lines
Which circuit is responsible for converting binary information from n input lines to a maximum of 2𝑛 unique output lines in combinational logic circuits?
Decoder
Study Notes
Combinational Logic Circuits
- The primary purpose of a combinational logic circuit is to produce output based on the current input.
- Examples of combinational logic circuits include decoders, adders, and subtractors.
Decoder
- The main function of a decoder in combinational logic circuits is to generate the output based on the input code.
Sequential Logic Circuits
- The role of a sequential logic circuit is to produce output based on the current input and the previous input/output.
- Sequential logic circuits employ memory elements.
Flip-Flop
- The distinguishing feature of a flip-flop in sequential logic circuits is its ability to store binary information.
Combinational vs Sequential Circuits
- The main difference between combinational and sequential circuits is that combinational circuits do not store binary information, whereas sequential circuits do.
Arithmetic Circuits
- A half-adder circuit accepts 2 binary bits as inputs and produces sum and carry.
- A full-subtractor circuit accepts 2 binary bits (minuend and subtrahend) and produces difference and borrow.
- A half-subtractor circuit accepts 2 binary bits (minuend and subtrahend) and produces difference and borrow-out.
Binary Parallel Adder
- The function of a Binary Parallel Adder circuit is to add multiple binary bits in parallel.
- The primary function of a half-adder circuit in combinational logic is to add 2 binary bits.
- A full-adder circuit is distinguished from a half-adder circuit in combinational logic by its ability to add 3 binary bits (2 inputs and a carry-in).
Magnitude Comparator
- The primary function of a magnitude comparator in combinational logic circuits is to compare the magnitude of two binary numbers.
Sequential Logic Circuits
- A Mealy machine is a type of sequential logic circuit that employs memory elements such that the state of each output channel depends on the previous states of the input channel.
- The distinguishing feature of a shift register in sequential logic circuits is its ability to shift binary data.
- The function of a demultiplexer in combinational logic circuits is to connect a single input line to one of multiple output lines.
Encoder
- An encoder is a circuit that is responsible for converting binary information from n input lines to a maximum of 2^n unique output lines in combinational logic circuits.
Test your knowledge of combinational logic circuits, including the differences between combinational and sequential circuits, as well as arithmetic circuits like half-adders. This quiz covers the basic concepts and components of combinational logic circuits.
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