Hybrid method for high-speed serial link skew calibration

Abstract

The invention relates to a hybrid method for high-speed serial link skew calibration and provides a method for reducing a clock-data skew in a serial interface. A clock signal and a data signal are received through the serial interface at first and second inputs of an exclusive OR (XOR) averaging (XOR-averaging) gate. An output of the XOR-averaging gate is determined and compared with a target value. At least one of a delay of the clock signal and a delay of the data signal is determined based on comparing the output of the XOR-averaging gate with the target value. A skew between the clock signal and the data signal is reduced by delaying at least one of the clock signal and the data signal.

Description

technical field [0001] The present disclosure relates generally to deskew of high speed serial interfaces, and in particular, but not exclusively, to high speed serial interfaces compliant with the Mobile Industry Processor Interface (MIPI) standard. Background technique [0002] Image sensors have become ubiquitous. They are widely used in digital still cameras, cellular phones, security cameras, as well as in medical, automotive and other applications. The technology used to make image sensors has continued to evolve at a great pace. For example, the need for higher image sensor resolution and lower power consumption has driven further miniaturization of image sensors and integration into digital devices. [0003] The increase in data bandwidth requirements has led to the development of different data transfer protocols using higher data transfer rates. However, these higher data transfer rates leave less time for setup and hold times during transfer of the digital data...

AI Technical Summary

Problems solved by technology

For example, timing errors (also known as skew errors) that are tolerable at lower data rates can result in unacceptable levels of errors at higher data rates

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