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Engineering Digital Design
book

Engineering Digital Design

by Richard F. Tinder
January 2000
Intermediate to advanced content levelIntermediate to advanced
884 pages
29h 39m
English
Academic Press
Content preview from Engineering Digital Design
16.4 ONE-HOT PROGRAMMABLE ASYNCHRONOUS SEQUENCERS 835
Of course, the one major drawback to MAC module FSM design is the fact that each
state-to-state transition must involve one, and only one, state variable change. Thus, the
controller state machine must be composed of an even number of states that are unit-
distance coded. When this is not the case, the logical adjacency requirement must be met by
either adding buffer states or by increasing the number of state variables. Adding a buffer
state may or may not be acceptable, since it does introduce a delay in executing a given
transition. Adding state variables may require increasing the size (capacity) of the MAC
module. As an example, the vending machine controller in Fig. P13.2 would require
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Publisher Resources

ISBN: 9780126912951