Logic 7: Functions of Combinational Logic

Question 1

A combinational logic circuit that is designed by connecting one XOR gate and one AND gate

Answer 1

Half Adder

Question 2

Is a combinational logic circuit that adds two 1-bit digits

Answer 2

Half-Adder

Question 3

Is a combinational logic circuit that performs an addition operation on three one-bit binary numbers

Answer 3

Full-Adder

Question 4

A combinational logic circuit that is designed by connecting two XOR gates, two AND gates, and one OR gate

Answer 4

Full Adder

Question 5

Is one in which the carry output of each full adder is connected to the carry input of the next higher-order stage

Answer 5

Ripple Carry Adder

Question 6

Anticipates the output carry of each stage, and based on the inputs, produces the output carry by either carry generation or carry propagation

Answer 6

Look-Ahead Carry Adder

Question 7

Occurs when an output carry is produced internally by the full-adder

Answer 7

Carry Generation

Question 8

Occurs when the input carry is rippled to become the output carry

Answer 8

Carry Propagation

Question 9

It compares the magnitude of two binary quantities to determine the relationship of those quantities

Answer 9

Comparator

Question 10

A comparator used for Inequality

Answer 10

4-Bit Comparator

Question 11

Is a digital circuit that detects the presence of a specified combination of bits on its inputs and indicates the presence of that code by a specified output level

Answer 11

Decoder

Question 12

Converts each BCD code into one of ten possible decimal digit indications

Answer 12

BCD-to-Decimal Decoder

Question 13

Accepts the BCD code on its inputs and provides output to drive 7-segment display devices

Answer 13

BCD-to-7-Segment Decoder

Question 14

Is a combinational logic circuit that essentially performs a “reverse” decoder function

Answer 14

Encoder

Question 15

Accepts active level on one of its inputs and converts it to a coded output

Answer 15

Encoder