Method and apparatus for signal detection and baseline wander cancellation

摘要

Apparatus, methods, and other embodiments associated with reliably determining signal loss over a data communication channel have been described. According to one embodiment, a method includes receiving input signals at an input of a serializer/deserializer device and equalizing the input signals to form equalized signals which compensate for frequency response distortion. The method also includes analyzing the equalized signals to determine whether peak amplitudes of the equalized signals are within a range of amplitudes defined by two threshold values. Furthermore, the method includes analyzing the equalized signals to determine whether logic levels of the equalized signals correspond to a sequence of a same logic level. The method further includes generating a signal absent indicator when the peak amplitudes of the equalized signals are within the range, or when the logic levels of the equalized signals correspond to the sequence of the same logic level.

主权项

1. An apparatus comprising:
signal detection logic configured to determine when peak amplitudes of equalized receiver signals are within or outside of a range of amplitudes defined by two threshold values, wherein the equalized receiver signals are derived from raw receiver input signals; decision logic configured to determine logic levels of the equalized receiver signals; stream detection logic configured to determine when the logic levels of the equalized receiver signals correspond to a sequence of a same logic level; and signal loss logic configured to determine that valid data traffic is absent among the raw receiver input signals when:
(i) the peak amplitudes of the equalized receiver signals are within the range as determined by the signal detection logic, or(ii) the logic levels of the equalized receiver signals correspond to the sequence of the same logic level as determined by the stream detection logic.