The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
Oct. 22, 2024
Filed:
Jan. 05, 2023
Cypress Semiconductor Corporation, San Jose, CA (US);
Karthik Sivaramakrishnan, Bangalore, IN;
Hamid Khodabandehlou, Milpitas, CA (US);
Godwin Arulappan, Sunnyvale, CA (US);
Jagadeesan Rajamanickam, San Jose, CA (US);
Manaskant Dipakkumar Desai, Bangalore, IN;
Nimish Thakkar, Bangalore, IN;
CYPRESS SEMICONDUCTOR CORPORATION, San Jose, CA (US);
Abstract
A USB controller includes: a USB interface that receives an isochronous timestamp packet (ITP) from a host device that includes a current time value from the host device and a delay value associated with each hub through which the ITP passed; controller hardware that initiates a counter, sends a link delay measurement (LDM) link management packet (LMP) request to a nearest upstream hub, stores a first timestamp that corresponds to when the LDM LMP request was sent, receives an LDM LMP response from the nearest upstream hub, and stores a second timestamp that corresponds to when the LDM LMP response was received; and controller software that calculates a link delay between the USB controller and the nearest upstream hub based on the first and second timestamps and delay information included in the LDM LMP response, and adjusts the counter value based on the calculated link delay.