Glossary Glossary
Glossary
Cross-Over Points
The Cross-Over point is defined as the intersection of t he D+ and D– single-ended signals. For differential
signals, the Cross-Over is zero crossings of the differential signal.
Downstream
The direction of data flow from the host or away from the host. A downstream port is the port on a hub
electrically farthest from the host that generates downstream data traffic from the hub. Downstream ports
receive upstream data traffic.
EOP
End-of
-Packet.
EOP(E),Idle(I),J,K
The different bus states o f the USB signal.
Eye Pattern
A representation of the USB signal that provides minimum and maximum voltage levels, as well a s
the signal jitter.
E
ye Violation
Any part of the waveform that crosses the defined eye mask.
Full-speed
USB operation at 1 2 Mb/s.
High-speed
USB operation at 480 Mb/s.
Host
The host computer system where the USB Host Controller is installed. This includes the host hardware
platform (CPU, bus, etc.) and the operating system in use.
Host Controller
The host’s USB interface.
Hot-Plug
It is the technology that supports automatic configuration of the PC hardware and the attached device. You
can attach a device or hot plug and start working without having to manually configure the device. This is
how it is referred to in the application.
HUT
A Host/Hub Under Test.
TDSUSB2 Universal Serial Bus Measurements Package 213
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