Signal loss detector for high-speed serial interface of a programmable logic device
AssigneeAltera Corporation
InventorsWeiqi Ding, Sergey Shumarayev, Wilson Wong, Thungoc M. Tran, Tim Tri Hoang
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Abstract
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 fails to match any of the at least one predetermined pattern, or if transitions are detected by the analog monitoring, even if the digital comparison produces a pattern match, then loss of signal is not indicated.
Claims22
1-20. (canceled)
A loss-of-signal detector comprising:
- a digital detector that processes incoming data digitally to provide a first indication;
- an analog detector that processes an analog characteristic of said incoming data to provide a second indication;
- and
- a decision circuit that outputs a loss-of-signal indication based on said first and second indications.
A method for detecting loss-of-signal, said method comprising:
- generating a pattern of incoming data from samples of incoming data and providing a first indication based on said predetermined data pattern;
- generating a second indication based upon an analog characteristic of said incoming data;
- and
- outputting a loss-of-signal indication based on said first and second indications.
A signal status detector comprising:
- a digital detector that processes incoming data digitally to provide a first indication;
- an analog detector that processes an analog characteristic of said incoming data to provide a second indication;
- and
- a decision circuit that outputs a signal status indication based on said first and second indications.
Dependencies are inferred from the claim text.