
USB2.0 Basics - Architecture
• USB Architecture
Host /
System
Devices
Hub
Down
stream
Up
stream
• Differential Signal
• Max USB cable length of 5m
• Up to 5 Hubs
• Data from PC to the device is
called Downstream
• Data from device to PC is called
Upstream
USB Cable
+ Shield
D+
VBUS
D-
Ground
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