UNIVERSAL SERIAL BUS (USB) CONTROLLER, METHOD OF OPERATING A USB CONTROLLER, AND MACHINE VISION SYSTEM

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 lin...

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Bibliographische Detailangaben
Hauptverfasser:	Sivaramakrishnan, Karthik, Khodabandehlou, Hamid, Desai, Manaskant Dipakkumar, Thakkar, Nimish, Arulappan, Godwin, Rajamanickam, Jagadeesan
Format:	Patent
Sprache:	eng
Schlagworte:	CALCULATING COMPUTING COUNTING ELECTRIC COMMUNICATION TECHNIQUE ELECTRIC DIGITAL DATA PROCESSING ELECTRICITY PHYSICS PICTORIAL COMMUNICATION, e.g. TELEVISION
Online-Zugang:	Volltext bestellen
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Beschreibung
Zusammenfassung:	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.