Detection of the Stuck-at-0 faults (SA0) on 4x16 decoder
                    To detect a stuck at fault, error signal must be propagated (must affect the value).This is called
                  
                  
                  
                    ATPG is a tool that can ascertain presence and abscence of faults at some locations in the circuits.ATPG stand for
                  
                  
                  
                    In order to detect a fault at 'h', we need to provide fault-free logic value at 'h' location.This is called
                  
                  
                  
                    It is always possible to detect a Stuck-at-0 fault using some input values.
                  
                  
                  
                    SA0 present at a location means the signal passing through that line