JTAGchain bus switching and configuring device

US7711993B2 · kind B2 · utility

Assignee

• International Business Machines Corporation · US

Inventors

• Mike C. Duron · Pflugerville, US
• Robert Allan Faust · Austin, US
• Forrest Clifton Gray · Austin, US
• Ajay Kumar Mahajan · Austin, US
• Glenn Rueban Miles · Austin, US

Key dates

• Filing date: Oct 14, 2008
• Grant date: May 4, 2010
• Expiry date: Oct 14, 2028

Classification

• Technology area (CPC G): Physics
• CPC primary: G06F13/4022
• WIPO field: Measurement
• WIPO sector: Instruments

Abstract

A JTAG bus cross point switching device that is commanded by the same bus which it configures. In a preferred embodiment a JTAG chain includes a cross point switching device that is capable of adding, omitting, or rearranging devices on a JTAG bus. The switching device itself is controlled by commands on the JTAG bus which it configures.