Transition detector
First Claim
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1. A transition detector, comprising:
- clock-pulse-generation circuitry configured to receive a clock signal and generate a clock pulse comprising a first pair of consecutive opposite logic transitions in response to a single transition edge of the clock signal, said first pair of consecutive opposite logic transitions separated by a length that is approximately equal to a length of a time window that is offset from the single transition edge of the clock signal; and
data-pulse-generation circuitry configured to receive a data signal and generate a data pulse comprising a second pair of consecutive opposite logic transitions in response to a single transition edge of the data signal, the data-pulse-generation circuitry including delay circuitry configured to delay the generation of the data pulse; and
a logic circuit coupled to logically combine the data pulse and the clock pulse in order to detect whether the data pulse and clock pulse simultaneously have a same logic state and generate an output signal in response thereto indicating that the single transition edge of the data signal has occurred within said time window.
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Abstract
An embodiment of a detector includes first and second generators. The first generator is operable to receive a transition of a first signal and to generate in response to the transition a first pulse having a length that is approximately equal to a length of a detection window. And the second generator is operable to receive a second signal and to generate a second pulse having a relationship to the first pulse in response to a transition of the second signal occurring approximately during the detection window.
7 Citations
32 Claims
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1. A transition detector, comprising:
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clock-pulse-generation circuitry configured to receive a clock signal and generate a clock pulse comprising a first pair of consecutive opposite logic transitions in response to a single transition edge of the clock signal, said first pair of consecutive opposite logic transitions separated by a length that is approximately equal to a length of a time window that is offset from the single transition edge of the clock signal; and data-pulse-generation circuitry configured to receive a data signal and generate a data pulse comprising a second pair of consecutive opposite logic transitions in response to a single transition edge of the data signal, the data-pulse-generation circuitry including delay circuitry configured to delay the generation of the data pulse; and a logic circuit coupled to logically combine the data pulse and the clock pulse in order to detect whether the data pulse and clock pulse simultaneously have a same logic state and generate an output signal in response thereto indicating that the single transition edge of the data signal has occurred within said time window. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9)
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10. A circuit-implemented method, comprising:
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receiving a clock signal; generating a clock pulse comprising a first pair of consecutive opposite logic transitions in response to a single transition edge of the clock signal, said first pair of consecutive opposite logic transitions separated by a length that is approximately equal to a length of a time window that is offset from the single transition edge of the clock signal; receiving a data signal; generating a data pulse comprising a second pair of consecutive opposite logic transitions in response to a single transition edge of the data signal, wherein said generating the data pulse comprises delaying the generation of the data pulse; logically combining the data pulse and the clock pulse in order to detect whether the data pulse and clock pulse simultaneously have a same logic state; and generating an output signal in response to the logical combining indicating that the single transition edge of the data signal has occurred within said time window. - View Dependent Claims (11, 12, 13, 14, 15, 16, 17, 18)
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19. A detector, comprising:
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a first generator configured to receive a first signal and to generate in response to a single transition of the first signal a first pulse comprising a first pair of consecutive opposite logic transitions separated by a length that is approximately equal to a length of a detection window; a second generator configured to receive a second signal and to generate in response to a single transition of the second signal a second pulse comprising a second pair of consecutive opposite logic transitions; and an error indicator coupled to receive the first and second pulses from the first and second generators, respectively, configured to detect whether the second pulse and the first pulse simultaneously have a same logic state, and configured to indicate in response to said detection that the single transition of the first signal occurred during said detection window. - View Dependent Claims (20, 21, 22, 23, 24, 25, 26, 27, 28, 29, 30, 31, 32)
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Specification