Marvell International Limited

Apple Inc.

Yi-Chun Chen

William Lo

Runsheng He

Haoli Qian

Hui Wang

Ping Zheng

Jeffrey Choun

Chee Hoe Chu

William O Ferry

Derek Fujio Iwamoto

Chee Hoa Chu

Mark Ferdinand Damarillo

Itay Franko

Systems, apparatuses, and methods for saving power on a bus interface are described. A system includes a host, a device, and a repeater interposed between the host and the device. While the host and device are in a low-power state, the repeater monitors a first bus to determine if the device has woken up. When the repeater detects a remote wake-up event initiated by the device, the repeater generates an interrupt which is sent to the host. The host responds to the interrupt by initiating a resume wake-up event procedure that assumes the device is still asleep. In this way, the host is able to stay in the low-power state longer while also using a wake-up procedure that does not require the host to be aware of the existence of the repeater.

Mechanism for saving power on a bus interface

A receiver including recovery, error, and control modules. The recovery module: receives a data signal and an offset value; based on a coefficient, equalizes the data signal to generate an equalized signal; and generates a recovered signal based on the equalized signal. The recovered signal includes data recovered by the recovery module. The error module generates an error value based on a difference between the equalized signal and a threshold. The control module, based on the offset value, the recovered signal, and the error value: generates the coefficient; determines the threshold; and determines a characteristic of an eye diagram of the recovered signal. The recovered signal has a non-repeating pattern such that overlaid traces of the recovered signal are in a shape of an eye and provide the eye diagram. The overlaid traces include jitter. The control module generates the coefficient to reduce an amount of the jitter.

Method and apparatus for reducing jitter in overlaid traces of an eye diagram of a recovered signal generated based on a received data signal

A system including a filter circuit, an error module, and a measurement module. The filter circuit receives, from a network device, an analog signal having jitter, generates an equalized signal based on digital feedback signals and the analog signal, and generates a recovered data signal based on the equalized signal. The recovered data signal includes data transmitted by the network device to the system. The error module generates an error signal based on the equalized signal and a threshold signal. The measurement module generates a multiple signals based on the recovered data signal, and the error signal. The multiple signals include the digital feedback signals and eye characteristic signals. The eye characteristic signals indicate characteristics of an eye diagram of the recovered data signal. The measurement module generates the digital feedback signals such that the eye diagram of the recovered data signal does not include the jitter.

Non-intrusive eye monitor system

A system including a summer, a comparator, a zero-crossing module, and a control module. The summer is configured to (i) receive a data input signal, and (ii) generate an equalized signal in response to the data input signal. The comparator is configured to generate a recovered data signal in response to the equalized signal. The zero-crossing module is configured to generate a zero-crossing signal in response to the equalized signal. The control module is configured to generate eye information in response to i) the recovered data signal and ii) the zero-crossing signal. The eye information includes characteristic data associated with the recovered data signal, and the characteristic data when plotted provides an eye diagram.

A signal receiver includes a data recovery module that generates an equalized data signal and a recovered data signal based on a data input signal. An error module generates an error information signal based on the equalized data signal and an error threshold signal. An eye measurement control module generates an eye characteristic signal based on the recovered data signal and the error information signal.

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San Jose, CA, United States of America

Yi-Chun Chen