Methods and apparatus to detect L2 entry and reset in universal serial bus repeaters

US12216602B2 · kind B2 · utility

Assignee

• TEXAS INSTRUMENTS INCORPORATED · US

Inventors

• Anant Shankar Kamath · Bengaluru, IN
• Suzanne Mary Vining · Plano, US
• Rakesh Hariharan · Bengaluru, IN
• Mark Edward Wentroble · Plano, US
• Christopher Rodrigues · Kanchinakote, IN
• Prajwala P · Cambridge, GB

Key dates

• Filing date: Jan 21, 2022
• Grant date: Feb 4, 2025
• Expiry date: Jan 21, 2042

Classification

• Technology area (CPC G): Physics
• CPC primary: G06F2213/0042
• WIPO field: Computer technology
• WIPO sector: Electrical engineering

Abstract

An example apparatus includes: a pullup circuit coupled to a first USB terminal; a first pulldown circuit coupled to the first USB terminal; a second pulldown circuit coupled to a second USB terminal; a third pulldown circuit coupled to a third USB terminal; a fourth pulldown circuit coupled to a fourth USB terminal; a high-speed termination detection circuit including: a current source including a first supply terminal and a second supply terminal, the first supply terminal coupled to the first USB terminal, the second supply terminal coupled to the second USB terminal; a first comparator including a first comparator terminal and a second comparator terminal, the first comparator terminal coupled to the first USB terminal; and a second comparator including a third comparator terminal and a fourth comparator terminal, the third comparator terminal coupled to the second USB terminal; and a controller including a first control terminal and a second control terminal, the first control terminal coupled to the second comparator terminal, the second control terminal coupled to the fourth comparator terminal.