Data interface that is configurable into separate modes of operation for sub-bit de-skewing of parallel-fed data signals

摘要

A data interface is provided that can de-skew data signals by taking into account different skewing effects on each data signal. The data interface can be used, for example, in a communication system and can be configured to operate in one of three possible modes of operation. In the first mode, de-skewing is fixed prior to the sample logic. In the second mode, de-skewing is periodically changed automatically as the amount of skew changes based on training signals that are periodically sent into the data interface. The combination of the data phase count and the positive and negative clock width pulse counts will then determine where the final transition or edge of each data signal is to be placed within a bit. The third mode of operation involves an override or programmatic modification of the second mode of operation based on values stored in a register.