Introduction
System Overview
TransDimension’s OTG243 is a low cost, high-performance, easily programmable device designed specifically for embedded USB host, USB function, and USB On-The-Go (OTG) dual role device (DRD) applications. It can be configured to operate as:
■ A standard USB OTG DRD controller (Port 1) and a standard USB 2-port host controller (Port 2 and Port 3).
■ A standard USB 2-port host controller (Port 2 and Port 3), and a standard USB function controller (Port 1).
■ A standard USB 3-port host controller (Port 1, Port 2 and Port 3).

The chip is designed for the embedded USB applications, especially mobile and post-PC products, including cell phones, palm platforms, personal digital assistants, set top boxes, home gateway systems, and Internet appliances. Peer-to-Peer communication is made simple with the OTG243 as USB connectivity may be achieved without the intervention of a personal computer. The block diagram for the OTG243 is shown below.