JPS5637733A - Multiplex majority logic circuit - Google Patents

Abstract

PURPOSE:To increase greatly the reliability through a comparatively simple circuit constitution, by providing the independent clock pulse to each system and then securing an asynchronous logic action for these systems. CONSTITUTION:The triple majority logic circuit is constituted by providing the reference pulse generating circuit CPG, the clock pulse producing circuit CP, the logic action control circuit LGC and the logic circuit LG each with every systems 1, 2 and 3. The circuit LGC includes the logic action start detecting circuit 2, the maximum logic action detecting circuit 3 and the majority circuit 4 each. And the same action is given to each system, and then the logic action is secured by obtaining a coincidence of the action (asynchronous) at least between two circuits among the three circuits. And the number of the clock pulses which satisfies the above conditions is detected by the circuit 3, and this detection signal is applied to the circuit of its own and other systsms in the form of the action control circuit (a). Thus the signal (a) as the result of decision by majority is applied to the circuit CP to complete a series of logic actions. After this, the logic action start signal produced newly from the circuit LG is detected 2, and thus a compensation is given newly to the phase of the clock pulse to continue the logic action.