6.4 Logic Gates: Fundamentals of Computer Systems: Computer Science Paper 2: A-Level AQA

What name is given to a collection of connected logic gates?

Logic Circuit

How many output to logic gates have?

1

What are the two inputs of an edge-triggered D-type flip-flop?

1. Data
2. Clock Signal

Which logic gate is represented by this symbol?

NAND

What mathematical operation does AND perform?

Multiplication

Which logic gate is represented by this symbol?

OR

What mathematical operation does OR perform?

Addition

Which logic gate only outputs FALSE when both inputs are FALSE?

OR

Which logic gate is represented by the symbol ⊕?

XOR

What type of logic circuit can be used to store the value of a single bit?

Edge-triggered D-type flip flop

Which logic gate outputs TRUE when strictly one inputs is TRUE?

XOR

Which logic gate is the equivalent of this logic circuit?

NAND

Draw the logic circuit for a half adder.

Which two logic gates are used in a half adder?

XOR and AND

When is the value stored by an edge-triggered D-type flip-flop set?

When the clock signal changes