Signal loss detector for high-speed serial interface of a programmable logic device
First Claim
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1. A loss-of-signal detector comprising:
- a digital data pattern detector that compares incoming data to at least one predetermined data pattern and provides a first loss-of-signal indication based on whether said incoming data match any one of said at least one predetermined data pattern;
an analog detector that outputs a second loss-of-signal indication based upon presence or absence of a plurality of transitions in said incoming data; and
a decision circuit that outputs a third loss-of-signal indication based on said first and second loss-of-signal indications.
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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.
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Citations
20 Claims
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1. A loss-of-signal detector comprising:
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a digital data pattern detector that compares incoming data to at least one predetermined data pattern and provides a first loss-of-signal indication based on whether said incoming data match any one of said at least one predetermined data pattern; an analog detector that outputs a second loss-of-signal indication based upon presence or absence of a plurality of transitions in said incoming data; and a decision circuit that outputs a third loss-of-signal indication based on said first and second loss-of-signal indications. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15)
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16. A method for detecting loss-of-signal in a serial data interface, said method comprising:
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comparing even samples of incoming data to a threshold using a first comparator and odd samples of said incoming data to said threshold using a second comparator, to generate a pattern of incoming data; comparing said pattern of incoming data to at least one predetermined data pattern, and providing a first loss-of-signal indication based on whether said incoming data match any one of said at least one predetermined data pattern; generating a second loss-of-signal indication based upon presence or absence of a plurality of transitions in said incoming data; and outputting a third loss-of-signal indication based on said first and second loss-of-signal indications. - View Dependent Claims (17, 18, 19)
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20. A loss-of-signal detector for use with a serial data interface for which there is at least one suspect data pattern that is, at different times, (a) a legal pattern and (b) an indication of signal loss, said loss-of-signal detector comprising:
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a digital data pattern detector that (1) compares incoming data to at least one predetermined data pattern and (2) provides a first loss-of-signal indication based on whether said incoming data match any one of said at least one predetermined data pattern; an analog detector that outputs a second loss-of-signal indication based upon presence or absence of a plurality of transitions in said incoming data; and a decision circuit that outputs a third loss-of-signal indication based on said first and second loss-of-signal indications.
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Specification