| 摘要 |
PURPOSE:To enable one logic circuit to obtain functions of two kinds of logic circuit by composing the logic circuit of several logic circuits which generate an OR-ELSE output and coincidence detection output, a parity generating circuit and a circuit which outputs the AND of the coincidence detection output. CONSTITUTION:Input-stage logic circuit 60 supplied with two inputs 52 and 53 is constituted basing upon a current changeover type circuit. When inputs 52 and 53 with a high voltage and low voltage taken as logic ''0'' and ''1'' respectively are both higher or lower than reference voltage VR1, logic ''1'' and logic ''0'' appear at output lines 72 and 73. Circuits 61 to 63 operate in the same way as circuit 60 and when either output 73 or 75 is lower than voltage VR1, logic ''1'' appears at output terminal 85 of logic circuit 84. Then, the parity generating circuit is constituted which generates ''1'' at terminal 85 with logic ''1'' applied to an odd number of terminals among terminals 52 to 59. When the odd-numbered logic combination agrees with the odd-numbered one, logic ''1'' appears at output terminal 93 of logic circuit 95 and when disagreeing, logic ''1'' is outputted to terminal 94. |
