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Unformatted text preview: (referred to as Boolean algebra hereafter for convenience). In Boolean algebra, a variable can assume only one of the two values, true or false , which are represented by the two symbols “1” and “0,” respectively. Note that “1” and “0” here do not represent numerical quantities. Physical representations of the two symbols depend on the logic family of choice. Consider the most popular CMOS logic as an example; the two symbols “1” and “0” represent two distinct voltage levels, V dd and ground, 3 respectively. Whether a signal’s value is 1 or 0 depends on which voltage source it is connected to. 4 3 Assume that positive logic is used. 4 In the following discussion, it is assumed that the CMOS logic family is chosen....
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- Spring '08