Four‐bit binary counter with parallel load. Do check it out. It has been tested!
A Full Subtractor is a combinational logic circuit that is designed to perform the subtraction of two binary numbers. It is considered "full" because it not only considers the subtraction of two binary inputs but also accounts for a borrow input from the previous stage. In other words, it can subtract three binary bits - minuend, subtrahend, and borrow - to produce the difference and a borrow output.