Code violation detection circuit for use in AMI signal transmission.

摘要

A circuit for detecting a code violation in an alternate mark inversion signal comprises a first detecting circuit (16) receiving the alternate mark inversion signal for generating a first detection signal (c) at continuous occurrence of two first polarity signals without interleaving a second polarity signal, the first and second polarity signals being indicative of the same binary logical level, and a second detecting circuit (18) receiving the alternate mark inversion signal for generating a second detection signal (d) at continuous occurrence of two second polarity signals without interleaving the first polarity signal. The first detection signal (c) is inputted to a first enable signal generating circuit (24) for generating a first enable signal (e) having a predetermined active period, and the second detection signal (d) is inputted to a second enable signal generating circuit (20) for generating a second enable signal (f) having a predetermined active period. A first violation detection circuit (28) receives the second detection signal (d) and the first enable signal (e) and generates a first code violation detection signal (g) when the second detection signal (d) is generated during the active period of the first enable signal (e). A second violation detection circuit (20) receives the first detection signal (c) and the second enable signal (f) and generates a second code violation detection (h) signal when the first detection signal (c) is generated during the active period of the second enable signal (f).