Method and apparatus for high speed data transmission between two systems operating under the same clock with unknown and non constant skew in the clock between the two systems

摘要

The invention is directed to a method by which data from a first synchronous subsystem is transmitted to a second synchronous subsystem physically spaced from the first subsystem such that the system clock is skewed relative to the two subsystems. Pursuant to the invention, the transmitted data cycle time is multiple of the common system cycle time and a clock signal is forwarded with the data from the first subsystem to the second subsystem. The clock signal forwarded with the data provides an indication to the second subsystem of the instants of time at which received data changes. The data change instants are used to generate a binary signal that inverts its value at each such instant. The binary signal is transmitted through a synchronizer to produce a logic signal in the second subsystem. The logic signal is utilized to transmit the received data into the second subsystem in synchronization with the clock of the second subsystem.