446 Keysight M8000 Series of BER Test Solutions User Guide
7 Setting up Patterns
• Polling.PortConfig - Polling.PortConfig is a substate where a port
configures its PHY according to PHY Capability LBPM matched in
Polling.PortMatch, and synchronizes with its link partner in exiting
from this substate to Polling.RxEQ. Depending on matched PHY
Capability LBPM, a port may configure its PHY for SuperSpeed
operation or SuperSpeedPlus operation.
• Polling.RxEQ - Polling.RxEQ is a substate for receiver equalization
training. A port is required to complete its receiver equalization
training.
• Polling.Active - Polling.Active is a substate that continues the link’s
Enhanced SuperSpeed training.
• Polling.Configuration - Polling.Configuration is a substate where
the two link partners complete the Enhanced SuperSpeed training.
• Polling.Idle - Polling.Idle is a substate where the port decodes the
TS2 ordered set received in Polling.Configuration and determines
the next state.
3 U0 - U0 is the normal operational state where packets can be
transmitted and received. U0 does not contain any substate machines.
4 Recovery - The Recovery link state is entered to retrain the link, or to
perform Hot Reset, or to switch to Loopback mode. In order to retrain
the link and also minimize the recovery latency, the two link partners
do not train the receiver equalizers. Instead, the last trained equalizer
configurations are maintained.
It contains three sub-states:
• Recovery.Active - Recovery.Active is a substate to train the
Enhanced SuperSpeed link by transmitting the TS1 ordered sets.
• Recovery.Configuration - Recovery.Configuration is a substate
designed to allow the two link partners to achieve the Enhanced
SuperSpeed handshake by exchanging the TS2 ordered sets.
• Recovery.Idle - Recovery.Idle is a substate where a port decodes
the link configuration field defined in the TS2 ordered set received
during Recovery.Configuration and determines the next state.
5 Loopback - Loopback is intended for test and fault isolation. Loopback
includes a bit error rate test (BERT) state machine. A loopback master
is the port requesting loopback. A loopback slave is the port that
retransmits the symbols received from the loopback master.
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