Altera Corporation

Audrey Catherine Kertesz

Dana How

Carl Ebeling

Systems and methods for phase detection are disclosed. Phase alignment between first and second clock signals is detected using a comparison of outputs from a collapsible pipeline and a non-collapsible pipeline.

Systems and methods for clock alignment using pipeline stages

Systems and methods for phase detection are disclosed. A collapsible three-stage pipeline includes a first register in a first stage having a first clock signal having first clock edges, a second register in a second stage that receives a first signal from the first stage, and having a second clock signal having second clock edges, and a third register in a third stage that receives a second signal from the second stage, and having a third clock signal having third clock edges, wherein each second clock edge has a corresponding first clock edge and a corresponding third clock edge. The circuitry may further include a two-stage pipeline including fourth and fifth stages, a counter that provides an input signal into the collapsible three-stage pipeline and the two-stage pipeline, and a comparator that compares a first output of the collapsible three-stage pipeline and a second output of the two-stage pipeline.

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Toronto, Canada

Audrey Catherine Kertesz