4 Bit Parallel Adder With Accumulator. It consists of full adders connected in a chain. Since the accumulator will be the one outputting the values it must be 6 bit.
This is a parallel adder. In a previous answer i explained how a full adder is a cascade of half adders. However to add more than one bit of data in length a parallel adder is used.
A parallel adder is an arithmetic combinational logic circuit that is used to add more than one bit of data simultaneously.
The way this adder should work is by connecting the output of the accumulator to the leds and to the input of the adder the other input goes to the slide switch which can be 4 bit. A parallel adder adds corresponding bits simultaneously using full adders. In a previous answer i explained how a full adder is a cascade of half adders. The block diagram of the adder accumulator combination is given below.
