Pericom Semiconductor Corporation

Diodes Inc.

Qualcomm Incorporated

Jin-sheng Wang

Kai Hung Yu

Lior Amarilio

Kwok Wing Choy

Multipath clock and data recovery circuits and multipath I/O devices are described that operate to provide flexible I/O paths for serial data communications. Active unidirectional components such as a clock and data recovery circuit may be used to implement different I/O paths. Bandwidth and signal degradation for high-speed serial data transmission is reduced.

Multipath clock and data recovery

Repeaters are described that operate to rapidly transition from low-power standby states to a low frequency signal transmission state. Bandwidth for high-frequency signal transmission is preserved.

Repeaters with fast transitions from low-power standby to low-frequency signal transmission

Referenceless clock and data recovery circuits are described that operate to align the clock/data strobe with each data eye to achieve a low bit error rate. The appropriate frequency and phase to be used is determined by an edge counter based frequency error detector and a phase error detector.

Referenceless clock and data recovery circuits

System, methods and apparatus are described that improve link turnaround performance in a differentially driven link. A method performed at a first device coupled to a two-wire serial link includes transmitting from the first device first differentially-encoded data to a second device over the two-wire serial link during a first time period, receiving at the first device second differentially-encoded data from the second device over the two-wire serial link during a second time period, and driving by the first device both wires of the two-wire serial link to a common voltage level during a third time period, the third time period spanning a link turnaround period between the first time period and the second time period. Both wires of the two-wire serial link are driven toward the common voltage level by the second device during the third time period.

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Cupertino, CA, United States of America

Jin-sheng Wang