Invention Grant
- Patent Title: Methods to remove dribble introduced and regenerate sync bits lost due to squelch delays in USB high speed packet repeating
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Application No.: US17119903Application Date: 2020-12-11
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Publication No.: US11528095B2Publication Date: 2022-12-13
- Inventor: Godwin Gerald Arulappan , Pradeep Kumar Bajpai
- Applicant: Cypress Semiconductor Corporation
- Applicant Address: US CA San Jose
- Assignee: Cypress Semiconductor Corporation
- Current Assignee: Cypress Semiconductor Corporation
- Current Assignee Address: US CA San Jose
- Main IPC: H04L1/00
- IPC: H04L1/00 ; H04L12/403 ; H04L43/0829 ; H04L69/22 ; H04L47/32 ; H04B3/58

Abstract:
Disclosed are techniques for removing dribble bits following the end-of-packet (EOP) of a High-Speed data packet inserted by the transmission envelope detector of a repeater/hub that interconnects electronic devices compliant with Universal Serial Bus (USB) Specification Revision 2.0 or higher. A physical layer logic (PHY) of a first port of the repeater/hub receives a High-Speed data packet to store a recovered bit stream into an elastic buffer. The recovered bit stream may include dribble bits inserted by the PHY after the EOP. The repeater/hub reads the recovered bit stream from the elastic buffer for transmission through the PHY of a second port. The repeater/hub monitors the EOP. When the EOP is detected, the repeater/hub prevents transmission of the dribble bits of the recovered bit stream following the EOP from the second port, eliminating the intended receiver of the High-Speed data packet from the complexity of dealing with dribble bits.
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