Keysight M8000 Series of BER Test Solutions User Guide 443
Setting up Patterns 7
Link Training for USB 3.0 and USB 3.1
The M8020A system allows you to test the physical layer compliance of a
USB 3.0 (SuperSpeed) and USB 3.1 (SuperSpeedPlus) DUT.
It provides the following types of testing:
• Transmitter Testing for USB 3.0/3.1
• Receiver Jitter Tolerance Testing for USB 3.0/3.1
The M8070A software provides the parameters which can be configured
for link training USB 3.0 and USB 3.1.
LTSSM (Link Training and Status State Machine)
Link Training and Status State Machine (LTSSM) is the sub-block that
drives and controls the link initialization, and training process for a USB
device to enable the normal data exchange between the two devices over
the link. LTSSM operates at the physical layer level and exchanges
physical layer packets (Ordered sets such as TS1 and TS2) to initialize,
train, and manage the link.
Two USB 3.0/3.1 instruments exchange Training Sequences as shown in
the following diagram:
Training Sequences are also used to switch the link to low power states.
P6 0.0 2.5
P7 -6.0 3.5
P8 -3.5 3.5
P9 0.0 3.5
Device A Device B
TS TS TS TS
TS TS TS TS
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