Introduction
USB is so commonplace that it has almost completely replaced other communication methods between peripheral devices and a PC. This holds true both for general-purpose devices, such as flash drives and mice, and special-purpose devices for specific applications. According to the standard USB 2.0 specification, USB peripherals do not communicate directly with one another; they may communicate only with a USB host, which fully controls data traffic on the bus. The Cypress EZ-USB FX3 with integrated high-speed USB host controller, along with the USB function and On-The-Go (OTG) capabilities accomplishes two things: It retains the device functions and allows embedded systems to act as a USB host.
