Pattern agnostic on-die scope

US8184757B2 · kind B2 · utility

Assignee

• SYNOPSYS, INC. · US

Inventors

• James P. Flynn · Beaverton, US
• Junqi Hua · Cary, US
• Robert B. Lefferts · Portland, US
• Richard H. Steeves · Portland, US
• John T. Stonick · Portland, US
• Daniel K. Weinlader · Allentown, US
• Jianping Wen · Beaverton, US
• Skye Wolfer · Hillsboro, US
• David A. Yokoyama-Martin · Portland, US

Key dates

• Filing date: Jun 21, 2010
• Grant date: May 22, 2012
• Expiry date: Nov 23, 2030

Classification

• Technology area (CPC G): Physics
• CPC primary: G01R13/0218
• WIPO field: Measurement
• WIPO sector: Instruments

Abstract

An on-die scope is described. The on-die scope can include one or more scope slicers, phase sweeping circuitry, voltage sweeping circuitry, and eye-diagram data collection circuitry. The clock and data recovery circuitry can receive an input signal, and output a recovered clock signal and a recovered bit-stream. The phase sweeping circuitry can receive the recovered clock signal, and output the scope clock signal by adding a phase offset to the recovered clock signal. A scope slicer can receive the voltage threshold, the scope clock signal, and the input signal, and output a scope bit-stream. The eye-diagram data collection circuitry can detect one or more bit-patterns in the recovered bit-stream, and modify values of one or more scope counters based solely or partly on the scope bit-stream and the recovered bit-stream.