Logic Circuit

Question 1

What is a D-type flip- flop

Answer 1

It is a memory element that stores a bit of data. It is controlled by a clock signal and captures the value of D when triggered

Question 2

Explain how D-type flip-flops can be used to store an 8-bit value in a computer register. [4 marks]

Answer 2

Eight D-type flip-flops are used, one for each bit [1 mark]
All flip-flops share the same clock signal so they update simultaneously [1 mark]
Each flip-flop’s D input receives one bit of the data to be stored [1 mark]
When the clock edge occurs, all 8 bits are captured and held until the next clock edge [1 mark]

Question 3

Why do we need the clock to dictate the output of the circuit?

Answer 3

By using the clock input to dictate when the output changes it means that we are able to have some stability to the circuitry at the moment that a process is taking place.

Question 4

what is full adder

Answer 4

A full-adder adds two single binary digits PLUS a carry input from a previous addition. This allows full-adders to be chained together to add multi-bit numbers.