Fundamentals of Digital Logic and Microcomputer Design, 5th by M. Rafiquzzaman

By M. Rafiquzzaman

Basics of electronic common sense and Microcomputer layout- Wiley India-M. Rafiquzzaman-2010-EDN-1

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By M. Rafiquzzaman

Basics of electronic common sense and Microcomputer layout- Wiley India-M. Rafiquzzaman-2010-EDN-1

Show description

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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.

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