The design of sequential logic circuits

The inadequacies of Combinational and Sequential Logic as circuit design techniques are pointed out; in particular, the Sequential Logic design technique due to Huffman has the disadvantage of leading to ‘race’ problems.The work of Moore on Finite Machine Theory points the way to design based on a state graph and this technique is advocated. An illustrative example of this technique is adduced.The case is made for the direct implementation of the state graph as a good design method and a novel logic element is proposed which is an analogue of a node on a state graph.