Download Digital Design With Cpld Applications And Vhdl 2000 by Delmar Thomson PDF

By Delmar Thomson

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17 NOR Gate Symbols The algebraic expression for the NOR function is: YϭA ෆෆϩ ෆෆB ෆ The entire function is inverted because the bubble is on the gate output. We know that the outputs of both gates are active LOW because of the bubbles on the output terminals. The inputs are active HIGH because there are no bubbles on the input terminals. 8 shows the truth tables of the 3-input NAND and NOR functions. 18. 8 3-input NAND and NOR Function Truth Tables A B C ෆ AෆиෆෆB ෆෆиෆෆC ෆ ෆ Aෆϩ ෆෆB ෆෆϩ ෆෆC ෆ 0 0 0 0 1 1 1 1 0 0 1 1 0 0 1 1 0 1 0 1 0 1 0 1 1 1 1 1 1 1 1 0 1 0 0 0 0 0 0 0 The truth tables of these gates can be generated by understanding the active levels of the gate inputs and outputs.

36 for a quadruple 2-input NOR gate. How does each numbering system differentiate between the NAND and NOR functions? 38 List six types of packaging that a logic gate could come in. “Hi-Z” How do the enable properties of these gates differ from gates such as AND and NAND? 2. 9 An AND needs two HIGH inputs to make a HIGH output. If the Control input is LOW, the output can never be HIGH; the output remains LOW. An OR output is HIGH if one input is HIGH. If the Control input is HIGH, the output is always HIGH, regardless of the level at the Signal input.

39 each produce a logic HIGH if the measured quantities exceed this value. The logic circuit interface produces a HIGH output to turn on the motor. Draw the symbol and truth table of the gate that corresponds to the action of the logic circuit. 19 for the case in which the motor is activated by a logic LOW. ” This is not the best statement of the operation of a multiple-input XOR gate. 22 and write a more accurate description of ninput XOR operation. 42: a. Write the truth table. b. Indicate with an * which lines on the truth table show the gate output in its active state.

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