Automatic vernier synchronization of skewed data streams.

摘要

A technique for automatically removing the skew between multiple correlated synchronous data streams provides Vernier Skew compensation. The data streams are marked into data frames under the control of local synchronized transmitter clocks. The data streams received at a receiver are loaded into FIFO registers under the control of recovered clocks. Data from the FIFO registers are unloaded under the control of a local receiver clock synchronized with the transmitter clocks. The frame marked data in the data streams is checked for a synchronization fault at the receiver. When a synchronization fault is detected in a data stream, the loading and unloading of the FIFO register corresponding to that data stream is inhibited and then the FIFO register is purged. A frame header in the data stream is detected and then the loading of the FIFO register is enabled with the first value to arrive which is marked as a frame header. At the next succeeding time for an expected frame header, normal unloading of the FIFO register is initiated. An alternate embodiment substitutes bi-port register arrays for the FIFO registers providing greater simplicity and flexibility.