Industry Expert Blogs

USB remains one of the most successful communication protocols in history. It has found its place in a wide range of devices such as personal computers, smart phones, gaming consoles, disk drives, portable media players and many more. Apart from being backward compatible, one of the main reasons for USB’s roaring popularity its ease of installation. This is due to the seamless way in which USB enumeration is done. In this blog we describe the USB enumeration process in detail.

There are a number of questions we answer here:

• How is the USB device identified by the host?
• How does the speed negotiation occur between USB host and device?
• How are the device capabilities known to the host?
• Does the enumeration process differ across the versions of USB?

In this blog we will find answers to the above questions and understand how the USB host learns about the device connection.