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Some USB Terms

Host — computer that controls the interface

Function — device that provides a capability to the host

Hub — device with one or more connections to USB devices plus hardware to enable

communications with each device

Device — something that attaches to a USB port (sometimes synonymous with a function)

Port — a connector on the USB Host bus

Suspend — Device enters Suspend after 3mS of inactivity on the bus to minimize power

consumption. Host uses timing packet to keep Peripherals active.

Enumeration — Initialization sequence to inform the host what device was attached to the

bus. Device parameters are conveyed at this point.

Descriptors — List of tables that identify the capabilities of the device

Endpoint — All transmissions travel to/from and endpoint which is just a block of memory or a

used for enumeration.

Descriptors — List of tables that identify the capabilities of the device

USB Ports

Here are some common terms when discussing USB. Take a moment to familiarize

yourself with these terms.

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