Download PDF by Robert Dueck: Digital Design with Cpld Applications and VHDL-Pld Lab
By Robert Dueck
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Extra resources for Digital Design with Cpld Applications and VHDL-Pld Lab Manual
11) and description of a 2-input NAND gate. 11. 11. 22 represent positive- and negative-logic forms of a NAND gate. 23 shows the logic equivalents of these gates. 22 NAND Gate and DeMorgan Equivalent A B AB AB A ϩB A A B B a. AND then invert b. 23 Logic Equivalents of Positive and Negative NAND Gates puts in an AND function, then invert the result. In the second case, we invert the variables, then combine the inverted inputs in an OR function. 22 are called DeMorgan equivalent forms. Both gates have the same truth table, but represent different aspects or ways of looking at the NAND function.
The confusion arises when, after changing the logic input and output levels, you forget to change the shape of the gate. This is a common, but serious, error. These inequalities can be expressed as follows: ෆ AෆиෆෆB ෆ ෆෆϩ A ෆෆB ෆ ෆ Aиෆ B ෆ Aϩෆ B 40 C H A P T E R 2 • Logic Functions and Gates As previously stated, any AND- or OR-shaped gate can be represented in its DeMorgan equivalent form. All we need to do is analyze a gate for its shape, input, and output, then change everything. 25 and write a Boolean expression, descriptive sentence, and truth table for the gate.
Make the truth table of this gate and draw an asterisk beside the line(s) of the truth table indicating when the gate output is in its active state. 6 State how three switches must be connected to represent a 3-input AND function. Draw a circuit diagram showing how this function can control a lamp. 7 State how four switches must be connected to represent a 4-input OR function. Draw a circuit diagram showing how this function can control a lamp. 8 Sketch the circuit of a single-pole single-throw (SPST) switch used as a logic switch.
Digital Design with Cpld Applications and VHDL-Pld Lab Manual by Robert Dueck