JPS6489638A - Digital signal receiving circuit - Google Patents

Abstract

PURPOSE:To prevent the malfunction of a receiving side device to be cused by a noise signal, etc., by providing a circuit to remove the noise signal, etc., to be guided by a tag signal line with using the clock of a receiving side. CONSTITUTION:Now, when data are sent from a transmitting device 10 on a data bus line 14, a tag signal to show the data are effective is sent through a tag signal line 13 to a receiving device 20 side. Then, this tag signal is passed through a line receiver 20 and inputted to a logical product circuit 27 and a data terminal S of a shift register circuit 26. On the other hand, the clock of a period T and a duty 50% is outputted from a clock generating circuit 25 and inputted to a clock terminal CP of the circuit 26 and the tag signal is shifted and successively outputted to output lines K1 and K2. In such a case, when the noise signal of a width (t) (T>t) is loaded on an output line (a) of the receiver 21, since a signal is not outputted to an output line (c) of the circuit 27, the noise signal, whose width is shorter than the T, is removed.