The first is a two-bit adder circuit that shows a binary sum and carry on two of the board’s five LEDs. This is a simple combinatorial circuit. It doesn’t make use of the onboard 12MHz clock.

Last time I talked about how to create an adder in Verilog with an eye to putting it into a Lattice iCEstick board. The adder is a combinatorial circuit and didn’t use a clock. This time, we&… ...

This paper focuses on the implementation and simulation of 4-bit, 8-bit and 16-bit carry look-ahead adder based on Verilog code and compared for their performance in Xilinx.