Compact and fast N-factorial single data rate clock and data recovery circuits
First Claim
1. A receiver circuit, comprising:
- a plurality of line interfaces configured to receive a spread signal distributed over the plurality of line interfaces, the spread signal carrying symbols with guaranteed symbol-to-symbol state transitions between consecutive symbols, the spread signal defined by a plurality of state transition signals including a first signal over a first line interface and a second signal over a second line interface;
a clock extraction circuit adapted to obtain a clock signal based on a comparison between a first instance of the first signal and a delayed second instance of the first signal, and a comparison between a first instance of the second signal and a delayed second instance of the second signal; and
a negative hold time logic circuit adapted to sample the delayed second instance of the first signal based on the clock signal and provide a symbol output.
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Accused Products
Abstract
A plurality of line interfaces is configured to receive a spread signal over the plurality of line interface. The spread signal carrying symbols with guaranteed symbol-to-symbol state transitions between consecutive symbols. The spread signal is defined by a plurality of transition signals including a first signal over a first line interface. A clock signal is extracted based on a comparison between a first instance of the first signal and a delayed second instance of the first signal. The delayed second instance of the first signal is sampled based on the clock signal to provide a symbol output. The clock extraction circuit is further adapted to generate the clock signal based on additional comparisons between a first instance of a second signal, within the plurality of transition signals, and a delayed second instance of the second signal, where the first and second signals are concurrent signals received over different line interfaces.
104 Citations
29 Claims
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1. A receiver circuit, comprising:
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a plurality of line interfaces configured to receive a spread signal distributed over the plurality of line interfaces, the spread signal carrying symbols with guaranteed symbol-to-symbol state transitions between consecutive symbols, the spread signal defined by a plurality of state transition signals including a first signal over a first line interface and a second signal over a second line interface; a clock extraction circuit adapted to obtain a clock signal based on a comparison between a first instance of the first signal and a delayed second instance of the first signal, and a comparison between a first instance of the second signal and a delayed second instance of the second signal; and a negative hold time logic circuit adapted to sample the delayed second instance of the first signal based on the clock signal and provide a symbol output. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12)
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13. A method operational on a receiver circuit, comprising:
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receiving a spread signal distributed over a plurality of line interfaces, the spread signal carrying symbols with guaranteed symbol-to-symbol state transitions between consecutive symbols, the spread signal defined by a plurality of state transition signals including a first signal over a first line interface and a second signal over a second line interface; obtaining a clock signal based on a comparison between a first instance of the first signal and a delayed second instance of the first signal, and a comparison between a first instance of the second signal and a delayed second instance of the second signal; and sampling the delayed second instance of the first signal based on the clock signal to provide a symbol output. - View Dependent Claims (14, 15, 16, 17, 18, 19, 20, 21, 22)
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23. A receiver circuit, comprising:
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means for receiving a spread signal distributed over a plurality of line interfaces, the spread signal carrying symbols with guaranteed symbol-to-symbol state transitions between consecutive symbols, the spread signal defined by a plurality of state transition signals including a first signal over a first line interface and a second signal over a second line interface; means for obtaining a clock signal based on a comparison between a first instance of the first signal and a delayed second instance of the first signal, and a comparison between a first instance of the second signal and a delayed second instance of the second signal; and means for sampling the delayed second instance of the first signal based on the clock signal to provide a symbol output. - View Dependent Claims (24, 25, 26, 27, 28, 29)
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Specification