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USB 3.0 adds mechanism for devices to send a Bus Interval Adjustment Message that is used by the host to adjust its 125 μs bus interval up to +/-13.333 μs. In addition, the host may send an Isochronous Timestamp Packet (ITP) within a relaxed timing window from a bus interval boundary.
Usb 2.0 has a latency of about 125 microseconds. Unlike 2.0, usb 3.0 is not a shared-bus system. Instead it uses a point-to-point link between the host and each device which can help decrease the latency by a significant amount (in terms of multiples, still not noticeable at all).
USB communications. This article provides information about the communications aspects of Universal Serial Bus (USB): Signaling, Protocols, Transactions. USB is an industry-standard used to specify cables, connectors, and protocols that are used for communication between electronic devices.
20 lis 2019 · Now, to actually answer your question, USB versions have a "minimum bus interval", which impacts the theoretical maximum polling rate a peripheral device can have. For example: USB 3.1 has a minimum bus interval of 125 μs, so the theoretical maximum polling rate is 8000 Hz. Here's what I could find: USB 1.1 and 2.0 - Low Speed
When taking into account protocol overheads, latency, and flow control, the fastest USB 3.2 Gen 1 device should operate at near 450Mbytes per second whereas a USB 3.2 Gen 2×1 device – in best case scenario – should perform at 1.1Gbytes per second under ideal conditions. But your mileage may vary depending on the system.
14 lip 2014 · However, you should check to see that your laptop (Windows device) actually classifies the USB 3.0 connection as a "super" data rate capable connection. There are four USB specs: 1.0, 1.1, 2.0, and 3.0. But to confuse things, each USB spec has more than one data rate assigned to it.
16 lip 2010 · Maximum roundtrip time for a USB connection is 1,500 ns. Removing a hub will shave off a couple nanoseconds. Unless your application needs sub-microsecond latency, this should be completely irrelevant. A PCIe USB card has a host controller of its own, giving you more total bandwidth.
