Programmable logic device integrated circuit with communications channels having sharing phase-locked-loop circuitry

Abstract

Integrated circuits such as programmable logic device integrated circuits are provided that have resource-efficient receiver circuitry. In source-synchronous system environments, an integrated circuit receives data on multiple buses, each of which has a reference clock signal and associated data signals. One of the reference clocks is provided to a phase-locked-loop circuit, which generates a serial clock and parallel clock for capturing and deserializing data for one of the buses. Each additional bus has an associated phase detector and delay-locked loop in place of a phase-locked loop. The phase detector and delay-locked loop in each additional bus shift the serial clock from the phase-locked loop to produce a serial clock for the additional bus. A parallel clock for each additional bus may be produced using a divider.