Input-output circuitry for integrated circuits

Abstract

An integrated such as a programmable integrated circuit may include input-output pins that have associated input-output circuits. An input-output circuit may include memory interface circuits, clock recovery interface circuits, shared interpolator circuitry, and selection circuitry that may be configured to convey control signals from selected interface circuits to the shared interpolator circuitry. The interpolator circuitry may receive multiple clock signals and perform phase interpolation operations on the clock signals based on the selected control signals to produce modified clock signals. The modified clock signals may be used by the selected interface circuits for communications over the input-output pins. Logic design computing equipment such as computing equipment having CAD tools may be used to configure the selection circuitry.