Logic DiagramsDOE-HDBK-1016/2-93TRUTH TABLES AND EXERCISESRev. 0Page 13PR-05Figure 12 Logic Gate Status NotationReadingLogicDiagramsWhen reading logic prints the reader usually must decide the input values to each gate. Butoccasionally the print will provide information as to the normal state of each logic gate. Thisis denoted by a symbol similar to the bistable symbol, as shown in Figure 12. The symbol isdrawn so that the first part of the square wave indicates the normal state of the gate. Thesecond part of the square wave indicates the off-normal state of the gate. Figure 12 alsoillustrates how this notation is applied.Reading a logic diagram that does not provide information on the status of the gates is not anymore difficult. It simply requires the reader to choose the initial conditions, determine theresponse of the circuits, and modify the inputs as needed. The following exercises will illustratehow to read some simple logic diagrams.ExamplesTo aid in understanding the material presented in this module, practice reading the followinglogic diagrams by answering the questions. The answers are on page 18.
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