Digital Logic Sim 2 by Lime Inc.

Digital Logic Sim by Sebastian Lague

TTL Simulator In JavaScript

Design of combinational digital circuits (Example) Example: Design a 4-input (A,B,C,D) digital circuit that will give at its output (X) a logic 1 only if there more ones than zeros in the binary number formed at the input. Inputs Output X = ABCD 0 0 0 0 0 1 0 0 0 1 2 0 0 1 0 3 0 0 1 1 4 0 1 0 0 5 0 1 0 1 6 0 1 1 0 7 0 1 1 1 8 1 0 0 0 9 1 0 0 1 10 1 0 1 0 11 1 0 1 1 12 1 1 0 0 13 1 1 0 1 14 1 1 1 0 15 1 1 1 1 CD 00 01 11 10 AB 00 01 11 10 X = A B C D