Download Experiments for Digital Fundamentals by David L Buchla PDF

By David L Buchla

Experiments for electronic basics

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Thus it is a base ten system. In this system, we represent quantities larger than 9 by using positional weight­ ing of the digits. The position, or column, that a digit occupies indicates the weight of that digit in determining the value of the number. The base 10 number system is a weighted system because each column has a value associated with it. Digital systems use two states to represent quantities and thus are binary in nature. The binary counting system has a radix of two and uses only the digits 0 and 1.

OR gates are available with more than two inputs. The operation of an n-input OR gate is summarized in the follow­ ing rule: The output is HIGH if any input is HIGH; other­ wise it is LOW. The XOR gate is a 2-input gate. Recall that the truth table is similar to the OR gate except for when both inputs are HIGH; in this case, the output is LOW. The truth table for a 2-input XOR gate can be summarized in the following statement: The output is HIGH only if one input is HIGH; otherwise it is LOW. The truth table for an XOR gate is shown in Table 5 - 1(b).

The symbols are shown in Figure 4-3 (f) and (g). The output of the XOR gate is HIGH when either A or B is HIGH, but not both (inputs “disagree”). The XNOR is just the opposite; the output is HIGH only when the inputs are the same (agree). For this reason, the XNOR gate is sometimes called a CO­ INCIDENCE gate. The logical operation of any gate can be sum­ marized with a truth table, which shows all the pos­ sible inputs and outputs. The truth tables for INVERT, AND, OR, XOR, and XNOR are shown in FIGURE 4-2 Examples of assertion-level logic.

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