Malfunction preventing circuit for serial signal transmission system

Abstract

Abstract PURPOSE:To prevent output of erroneous data from a decoding circuit by giving a stop signal corresponding to the detection output of the unlock state of a PLL circuit to an output stop circuit from a PLL lock detecting circuit because of transmission disturbance or the like. CONSTITUTION:In a malfunction preventing circuit 7, the first stop signal corresponding to the detection output of the unlock state of a PLL circuit 4 is given to an output stop circuit 6 from a PLL lock detecting circuit 5 through an OR circuit 13 because of transmission disturbance, and the comparison output from a comparing circuit 12 is given as the first stop signal to the output stop circuit 6 if the time delay of a reproduced clock due to dullness of the rise and the fall of the waveform of a synchronizing signal is degraded to a prescribed degree or more. Thus, erroneous data is prevented from being outputted from a decoding circuit 2 to an output terminal OUT.

Inventors

• 👤 Keizo Okuno

Bibliographic Details