By M. Rafiquzzaman
Basics of electronic common sense and Microcomputer layout- Wiley India-M. Rafiquzzaman-2010-EDN-1
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The concept of employer has lately elevated its in? uence within the examine and - velopment of computational common sense established structures, whereas even as signal- cantly gaining from many years of analysis in computational common sense. Computational good judgment offers a well-de? ned, normal, and rigorous framework for learning s- tax, semantics and techniques, for implementations, environments, instruments, and criteria, facilitating the ever vital hyperlink among speci?
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Additional resources for Fundamentals of Digital Logic and Microcomputer Design, 5th Ed
The number of states can be reduced by using the concept of equivalent states.
The Boolean expressions for the next state are obtained from the combinational circuit portion of the sequential circuit. 17 Present State Input Next State Flip Flop Inputs Output X Y A X+ Y+ Dx DY B 0 0 0 1 1 1 1 1 0 0 1 1 1 1 1 0 0 1 0 1 1 1 1 0 0 1 1 0 1 0 1 1 1 0 0 1 0 1 0 1 1 0 1 0 1 0 1 0 1 1 0 1 0 1 0 0 1 1 1 0 1 0 1 1 outputs of the combinational circuit are connected to the D inputs of the flip-flops. These D inputs provide the next states of the flip-flops after the clock pulse. 17. 1 depicts a typical state table.
As in the case of the ROM, these gate arrays can be realized using diodes, transistors, or MOS devices. The significance of a PLA is explained in the following example. 39. _ _ This _ PLA has three inputs, A , B, and C. The AND generates from product terms A B, A C, BC, and AC. These product terms are logically summed up in the OR array, and the outputs Z,,, Z , , and Z, are generated. Note that the dot in the figure indicates the presence of a switching element such as a diode or transistor. 3 combinational circuit realized by a ROM is very high and all input combinations are not used.