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Theory and Design of Mixed-Mode Sequential Machines
July 1980 (vol. 29 no. 7)
pp. 639-648
B.I. Dervisoglu, Department of Electrical Engineering and Computer Science, Computer Science Division, University of Connecticut
A mixed mode sequential machine (MSM) is defined as a representation in which both synchronous (clocked) and asynchronous (unclocked) state transitions are allowed. The intent of the representation is to allow designers to consider both types of transitions in a single structure, thereby promoting the use of LSI devices such as ROM's or PLA's to resolve the realization question. The approach is thus different from conventional design methods, in which asynchronous problems are treated separately with separate devices. The problems of state reduction, state assignment, and realization are covered. Of particular note is the development of a ROM implementation, which allows both clocked and unclocked transitions to occur.
Index Terms:
state reduction, Input hazard, one-hot assignment, k-extended one-hot assignment, mixed-mode sequential machine, mode consistency, ROM realization of sequential machine, sequential machine, state assignment
Citation:
B.I. Dervisoglu, H.A. Sholl, "Theory and Design of Mixed-Mode Sequential Machines," IEEE Transactions on Computers, vol. 29, no. 7, pp. 639-648, July 1980, doi:10.1109/TC.1980.1675635
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