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Link Layer Tests
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The CREDIT_HP_TIMER deadline value is 5000us. The value of
tLinkTurnAround is 500ns and is defined in the USB 3.0 Link Layer Test
Specification, Section 4. Please refer to that document for details.
The test passes if the exchanges are met, no timeout is detected, all packets
are successfully received, all credits are restored and the link stays in U0 for
at least 50ms.
Specification Reference
Section 7.2.4.1.10#7 ● Table 7-7
7.11
PENDING_HP_TIMER Timeout Test
Test Summary
This test verifies that the PUT will go to recovery when the PENDING_HP_TIMER expires.
Test Steps and Expected Results
1.
Examiner performs steps 1 to 3 of TD7.1 (Link Bring-Up Test) to bring the link to U0.
2.
Examiner and the PUT will exchange Port Configuration transactions, but in this case
Examiner will not respond to the first packet sent by the PUT.
If Examiner is configured as an Upstream Port:
a.
It waits for the PUT’s Port Capability LMP.
b.
Examiner will not respond to the PUT with a link layer handshake.
c.
Examiner transmits its Port Capability LMP and Port Configuration LMP.
If Examiner is configured as a Downstream Port:
a.
It waits for the PUT’s Port Capability LMP.
b.
Examiner transmits its PUT Port Capability LMP.
c.
Examiner will not respond to the PUT with a link layer handshake.
