On-chip clock control monitoring

US10459029B2 · kind B2 · utility

Assignee

• Seagate Technology LLC · US

Inventors

• Paras Gangwal · Jamkhed, IN
• Komal Shah · Mumbai, IN
• Surbhi Bansal · Pune, IN
• Sachin Shivanand Bastimane · Pune, IN

Key dates

• Filing date: Jan 8, 2018
• Grant date: Oct 29, 2019
• Expiry date: Apr 21, 2038

Classification

• Technology area (CPC G): Physics
• CPC primary: G01R31/318555
• WIPO field: Measurement
• WIPO sector: Instruments

Abstract

An on-chip clock (OCC) circuit of an integrated circuit includes a clock generator, an OCC controller, and an OCC observation circuit. The clock generator is configured to generate a plurality of clock signals. The OCC controller is configured to receive the clock signals and generate an OCC output for use by the scan chains of logic blocks. The OCC observation circuit is configured to generate a status output on a status output port based on the OCC output during an at-speed capture phase and a scan enable signal. Patterns of the status output with respect to the scan enable signal include a valid pattern indicating that the OCC output includes a valid number of at-speed capture pulses, a first invalid pattern indicating a first error in the OCC output, and a second invalid pattern indicating a second error in the OCC output that is different from the first error.