Operating Basics Selecting a Measurement
Area
Option
Description
Resume Test Resume Resumes the High-speed operation in a device
or a hub, which
is indicated by the presence of
High-speed SOF packets (with 400mV nominal
amplitude) following the K state driven by the h ost
controller. F
or the Host this is the time between
the falling edge of D+ to the First SOF. This should
not exceed 3.0mS
Rest from High-Speed Test
Reset
Measures the time between the beginning of the
last SOF and
before the reset and the beginning
of Chirp-K. This is between 3.1 ms and 6 ms.
This test will be applicable for Device and HUB
upstream
Reset from
Suspend
Reset from
Suspend
Measures t
he time between the falling edge of
D+ signal and the start of Device chirp-K. This is
between 2.5 us and 3 ms. This test is applicable
for Devic
e and HUB upstream
Packet Parameter Packet Parameter
Measures
the parameter of the packet such as
Sync Bits, EOP, and Inter-Packet Gap depending
on the selected m easurement
xxx
Select
ing a Measurement
To take
a measurement, select Measurement from the Measurements menu, which is also the default
opening screen in the application. To access the Selec t option in the Measurement menu, select
Measurements> Select.
Therearethreecategoriesofmeasurements:LowSpeed, Full Speed, and High Speed measurements. The
measurements for Low, Full and High Speed signals are Signal Quality Checks, Inrush Current Check,
and Droop Test. The additional measurements for High Speed tests are Receiver Sensitivity, Monotonic
Property, and Chirp Test, Packet Parameter, Suspend, Resume, Reset from Suspend, and Reset from
High Speed.
You nee d to sel ect the m easurements for a particular signal speed of the unit under test. After selecting the
tests, you m
ust configure the application based on Signal Source, Tier, Test Point, and Signal Direction.
You can test the u nits for the following:
Devices for Upstream Signal Quality Check
Hubs and Hosts for Downstream Signal Quality Check
Ports of a Hub for Droop Test
Devices for Inrush Current
See Also
Selecting a Measurement
30 TDSUSB2 Universal Serial Bus Measurements Package
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