Issue No.11 - November (1975 vol.24)
H.Y.H. Chuang , Department of Computer Science, University of Pittsburgh
Prof. Bredeson rightly points out that the realization shown in the Figs. 1 and 4 of the above paper1 imposes a restriction that Mealy machines cannot be realized. But, as we pointed out in Section V of our paper, the output flip-flops are used in our realization only to remove possible hazards in the output terminals. For some applications, the output hazards could be tolerable and in such situations the output flip-flops are not necessary. Evidently, the Mealy machines can be realized in such cases. It is pertinent here to point out that most of the previous works on asynchronous machines avoided the issue of output hazards.
H.Y.H. Chuang, "Authors' Reply<sup>2</sup>", IEEE Transactions on Computers, vol.24, no. 11, pp. 1143-1144, November 1975, doi:10.1109/T-C.1975.224152