User manual

A I R E N C E - U S B M a n u a l P a g e 47
2 Background
2.1 USB System Architecture

• Host (PC) Computer
• One or more USB Devices
• A physical bus represented by the USB Cable that links the devices with the host (PC) computer.
2.1.1 USB Host (your PC)


for a wide range of USB devices.
The drivers convert data between the format that is used by the host computer and the format used by the USB devices.

• Detecting the attachment and removal of USB devices
• Monitoring device status and collecting activity statistics
• Providing power to attached USB devices
• Managing control and data ow between the USB host and USB devices
• Checking the basic validity of bus transactions

• Handling USB devices and their connectivity
• USB devices enumeration and conguration
• Loading appropriate device drivers
• Managing the power on the bus and bus bandwidth
• Managing the data transfer between the software and hardware
USB Host (PC) Controller
A USB Host Controller is the hardware either on the computer motherboard or PCI card. It provides an interface for transferring
-

2.1.2 SB Devices
The USB Devices

fax modem device, a digital microphone, or a video camera.


USB Hub.