An integrated circuit device includes dispatcher circuitry that receives signals from a first number of sources, multiplexes the signals into a single mixed signal in a predetermined order, and transmits the mixed signal to a destination via a mixed signal interface having an arbitrary length and operating at an interface clock frequency equal to a product of a device clock frequency and the first number. A second number of samplers is disposed in series along the mixed signal interface, outputting a sampled mixed signal synchronized to the interface clock. A chain of tracking elements in series, corresponding in number to the second number, outputs a tracking indication separate from the sampled mixed signal. Capture circuitry demultiplexes the sampled mixed signal into a plurality of demultiplexed signals, according to a starting point based on the tracking indication, onto a plurality of signal buses corresponding in number to the first number.