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US 7,466,723 B2Granted
Various methods and apparatuses for lane to lane deskewing
AssigneeIntel Corporation
InventorsKersi H. Vakil, Adarsh Panikkar
Life of this patent
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Abstract
Various methods, apparatuses and systems are described in which a skew delay time between communication lanes is determined. A data transfer path is established which includes two or more communication lanes in a communication link. A skew delay time is determined between the communication lanes of the communication link with respect each other with using a clock period of a input output circuit as a reference time.
Claims13
An apparatus, comprising:
- an input output circuit with a deskewing logic configured to determine the number of input output circuit clock pulses for each lane as a skew delay time relative to a lane with a greatest skew delay to complete a deskew operation based on an actual skew present between lanes carrying signals with information that each have embedded timing information that relates to each other,
- wherein the deskewing logic includes a digital skew correction circuit to introduce delay in one or more lanes of the plurality of lanes to match the skew delay time of each lane.
A system, comprising:
- a first agent acting as transmitter;
- a second agent acting as receiver;
- an interconnect medium having two or more lanes to carry information in multiple signals that each carry embedded timing information that relates to each other, and the two or more lanes have different propagation delays for transmission of data on the two or more lanes, wherein the second agent contains deskewing circuitry located in a physical layer to deskew information received from the first agent in order to restore a time reference between the multiple signals with respect to each other;
- and
- an analog skew delay circuit in the second agent to insert an analog delay into each lane inversely proportional to approximately a period of an actual skew present in that lane compared to a skew delay present in a lane with a greatest skew delay time.
2 more elements
A system, comprising:
- a first agent acting as transmitter;
- a second agent acting as receiver;
- and
- an interconnect medium having two or more lanes to carry information in multiple signals that each carry embedded timing information that relates to each other, and the two or more lanes have different propagation delays for transmission of data on the two or more lanes, wherein the second agent contains deskewing circuitry located in a physical layer to deskew information received from the first agent in order to restore a time reference between the multiple signals with respect to each other, and
- wherein the deskewing circuitry includes a first counter circuit to determine skew present in a first lane after a data link layer in the second agent asserts a control signal and a lane with a greatest amount of skew delay experiences a transition from a training sequence.
2 more elements
Dependencies are inferred from the claim text.