A loss-of-signal detector includes digital and analog monitoring of incoming data. The incoming signal is compared digitally to at least one predetermined pattern that may indicate a loss of signal, and also is monitored by an analog detector that detects transitions in the data. If the digital comparison...http://www.google.de/patents/US8127215?utm_source=gb-gplus-sharePatent US8127215 - Signal loss detector for high-speed serial interface of a programmable logic device
