By Jr. Charles H. Roth, Lizy K. John
Written for an advanced-level direction in electronic structures layout, electronic structures layout utilizing VHDL integrates using the industry-standard description language VHDL into the electronic layout technique. Following a evaluate of uncomplicated ideas of good judgment layout, the writer introduces the fundamentals of VHDL, after which accommodates extra insurance of complex VHDL themes. instead of easily educate VHDL as a programming language, this publication emphasizes the sensible use of VHDL within the electronic layout technique.
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Extra resources for Digital Systems Design Using VHDL
6. Realize the flip-flop input equations and the output equations using the available logic gates. 7. Check your design using computer simulation or another method. Steps 2 through 7 may be carried out using a suitable computer-aided design (CAD) program. 8 Moore Sequential Circuit Design In a Moore circuit, the outputs depend only on the present state. Moore machines are typically easier to design and debug compared to Mealy machines, but they often contain more states than equivalent Mealy machines.
24 Review of Logic Design Fundamentals Figure 1-27 shows derivation of J-K flip-flop input equations for the state table of Figure 1-23 using the state assignment of Figure 1-24. First, we derive the J-K input equations for flip-flop Q1 using the Qϩ map as the starting point. From the 1 preceding table, whenever Q1 is 0, J ϭ Qϩ and K ϭ X. So, we can fill in the Q1 ϭ 0 1 half of the J1 map the same as Q1ϩ and the Q1 ϭ 0 half of the K1 map as all X’s. When Q1 is 1, J1 ϭ X and K1 ϭ (Q1ϩ)Ј. So, we can fill in the Q1 ϭ 1 half of the J1 map with X’s and the Q1 ϭ 1 half of the K1 map with the complement of the Qϩ .
3. Go through the table square by square. If square i-j contains the implied pair m-n, and square m-n contains an X, then i j, and an X should be placed in square i–j. 4. If any X’s were added in step 3, repeat step 3 until no more X’s are added. 5. For each square i-j that does not contain an X, i ϵ j. If desired, row matching can be used to partially reduce the state table before constructing the implication table. Although we have illustrated this procedure for a Mealy table, the same procedure applies to a Moore table.
Digital Systems Design Using VHDL by Jr. Charles H. Roth, Lizy K. John