Download Introduction to Digital Systems: Modeling, Synthesis, and by Mohammed Ferdjallah PDF

By Mohammed Ferdjallah

Electronic structures layout calls for rigorous modeling and simulation research that removes layout dangers and strength damage to clients. creation to electronic platforms: Modeling, Synthesis, and Simulation utilizing VHDL introduces the applying of modeling and synthesis within the powerful layout of electronic structures and explains acceptable analytical and computational tools. via step by step reasons and various examples, the writer equips readers with the instruments had to version, synthesize, and simulate electronic ideas utilizing Very excessive velocity built-in Circuit Description Language (VHDL) programming.

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Example text

The implementation of the elementary logic functions within the parentheses obeys the precedence rules as well. In all cases, the NOT function is implemented first, then the AND function, then the OR function. Similarly, a digital circuit can be converted to a logic expression. 1 x y x⊕ y NOT, AND, OR, and XOR Gates the input variables through the gates to the output of the circuit. The logic output expression of a gate is determined by the logic expressions at its inputs. 6. 5, but since the XOR function is a composite logic function consisting of two AND functions and one OR function, it has the same level of precedence as the AND function.

They are neither input ports nor output ports, and therefore do not have a direction. 20. 6. The architecture declaration has been modified to include the internal signals. The logic function of the circuit is described in an indirect way using the internal signals. 21) have the same logic function and should yield the same synthesized logic circuit.

The multiplexer has a single output, which has the same value as the data input selected. Now let us consider a 2 : 1 multiplexer. As the name indicates, it has two data inputs, x1 and x2, a select input, s, and a single output, y. The output of the circuit will be same as the value of input x1 if s ¼ 0; otherwise the output will be equal to x2. We can construct a truth table based on these requirements. 11. 12 which can be realized using one OR gate and two AND gates. 12. 2 Half-Adder The half-adder is an example of a simple functional digital circuit built from two logic gates.

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