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A wired logic connection is a logic gate that implements boolean algebra (logic) using only passive components such as diodes and resistors. A wired logic connection can create an AND or an OR gate. The limitations are the inability to create a NOT gate and the lack of level restoration. == The wired AND connection == The wired AND connection is a form of AND gate. It uses a pull up resistor and one diode per input to create this function. The positive voltage from the source is directed away from the output ''C'' and towards ''A'' and ''B'' via the diodes connected directed towards the inputs. When positive logic that is equal to or greater than that of the source is applied to all inputs the source voltage is directed to the output. The AND gate is capable of an arbitrary number of inputs. The wired AND function can be achieved by simply tying gate outputs together to a common-collector pull-up resistor. The wired AND function below is achieved by using open collector TTL gates. This is commonly called Dot OR. The output ''C'' is determined by the inputs at ''A'' and ''B'' according to the truth table (right).〔M. Morris Mano, ''Digital Logic and Computer Design'', Prentice-Hall, 1979 ISBN 0-13-214510-3, page 571 〕 抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』 ■ウィキペディアで「Wired logic connection」の詳細全文を読む スポンサード リンク
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