Keysight M8000 Series of BER Test Solutions User Guide 445
Setting up Patterns 7
The USB 3.0 and 3.1 LTSSM consists following states and their sub-states:
1 Rx.Detect - Rx.Detect is the power on state of the LTSSM for both a
downstream port and an upstream port. It is also the state for a
downstream port upon issuing a Warm Reset, and the state for an
upstream port upon detecting a Warm Reset from any other link state
except eSS.Disabled. The purpose of Rx.Detect is to detect the
impedance of far-end receiver termination to ground.
It contains three sub-states:
• Rx.Detect.Reset - Rx.Detect.Reset is a default reset state used by
the two ports to synchronize the operation after a Warm Reset; this
substate exits immediately if Warm Reset is not present.
• Rx.Detect.Active - Rx.Detect.Active is a sub-state for far-end
receiver termination detection.
• Rx.Detect.Quiet - Rx.Detect.Quiet is a power saving sub-state in
which the function of a far-end receiver termination detection is
disabled. A port will perform the far-end receiver termination
detection periodically during Rx.Detect.
2 Polling - Polling is a state for port capability negotiation and link
training. During Polling, a Polling.LFPS handshake shall take place
between the two ports in SuperSpeed operation before the link training
is started. Similarly for SuperSpeedPlus operation, Polling.LFPS based
SCD1/SCD2 handshakes, LBPM based port capability negotiation and
match, and subsequent port configuration shall take place before
SuperSpeedPlus link training is started. Bit lock, block alignment for
SuperSpeedPlus operation, symbol lock, lane polarity inversion, and Rx
equalization trainings are achieved using TSEQ, SYNC, TS1, and TS2
training ordered sets.
It contains the following sub-states:
• Polling.LFPS - Polling.LFPS is a substate designed to establish the
PHY’s DC operating point, and to synchronize the operations
between the two link partners after exiting from Rx.Detect. This is
also a substate for a port to identify itself based on various
Polling.LFPS signatures.
• Polling.LFPSPlus - Polling.LFPSPlus is a substate where the port
SuperSpeedPlus operation performs SCD2 handshake, for
additional confirmation of the SuperSpeedPlus capability of its link
partner.
• Polling.PortMatch - Polling.PortMatch is a substate where the two
ports in SuperSpeedPlus operation perform the LBPM handshake,
for announcing, matching, and deciding the operation on the
highest common capability between the two link partners.
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