14.3 FUNCTIONAL RELATIONSHIPS AND THE STABILITY CRITERIA 687
The model of Fig. 14.2 is the most degenerate (fundamental) form of the Mealy model
depicted in Fig. 10.5. This model can be broken down into the more rudimentary forms
similar in appearance to those in the development of the basic model in Fig. 10.3 or to the
Moore model in Fig. 10.4, but always with a memory stage composed of fictitious LPD
memory elements. Regarding the memory stage, it will be recalled that the memory for
the basic model in Fig. 10.3(c) is interpreted as basic cells in Fig. 10.22 or as a flip-flop in
the case of Fig. 10.36. In fact, the more general models given in Figs. 13.1 and 13.47 can
be used in synchronous systems where the memory is interpreted as discrete flip-flops, ...