 For instance , in electronic circuit design , static combinational logic blocks can be represented as an acyclic system of logic gates that computes a function of an input , where the input and output of the function are represented as individual bits . In general , the output of these blocks cannot be used as the input unless it is captured by a register or state element which maintains its acyclic properties . Electronic circuit schematics either on paper or in a database are a form of directed acyclic graphs using instances or components to form a directed reference to a lower level component . Electronic circuits themselves are not necessarily acyclic or directed . 
 For instance , in electronic circuit design , static combinational logic blocks can be represented as an acyclic system of logic gates <a href='null_relcl' title='1'><mark>that</mark></a><a href='uninflect' title='2'><mark>computes</mark></a> a function of an input , where the input and output of the function are represented as individual bits . In general , the output of these blocks cannot be used as <a href='None' title='3'><mark>the</mark></a><a href='negative_concord' title='4'><mark>input</mark></a> unless it is captured by a register or state element which <a href='uninflect' title='5'><mark>maintains</mark></a> its acyclic properties . Electronic circuit schematics either on paper or in a database <a href='drop_aux' title='6'><mark>are</mark></a>a form of directed acyclic graphs using instances or components to form a directed reference to a lower level component . Electronic circuits themselves <a href='negative_concord' title='7'><mark>are</mark></a> <a href='negative_concord' title='8'><mark>not</mark></a>necessarily acyclic or directed . 
Fa instance , in electronic circuit design , static combinational logic blocks can be represented as an acyclic system of logic gates compute a function of an input , where the input and output of the function are represented as individual bits . In general , the output of dem blocks cannot be used as no input unless it is captured by a register or state element which maintain its acyclic properties . Electronic circuit schematics either on paper or in a database a form of directed acyclic graphs using instances or components to form a directed reference to a lower level component . Electronic circuits themselves ain't necessarily acyclic or directed .