Link Layer Tests
| 61 of 124
S
u
pe
rS
pe
ed
U
S
B
Ex
pl
o
re
r
2
8
0
The test passes if the exchanges are met, no timeout is detected, the packet
that Examiner responded to with an LBAD is retransmitted correctly, all other
packets are received successfully, all credits are restored and the link stays in
U0 for at least 50ms.
Specification Reference
Section 7.2.4.1.3#1, 2
7.9
PENDING_HP_TIMER Deadline Test
Test Summary
This test verifies that the PUT will accept an LGOOD_N sent at the PENDING_HP_TIMER
deadline, minus tLinkTurnAround (i.e., at 2.5us after the end of the PUT’s Port Capabilities
LMP).
Test Steps and Expected Results
1.
Examiner performs the steps described in TD7.1 (Link Bring-Up Test) to bring the link to
U0, but transmits all LGOOD_N responses at [PENDING_HP_TIMER – tLinkTurnAround].
The PENDING_HP_TIMER deadline value is 3us. 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#2 ● Table 7-7
7.10
CREDIT_HP_TIMER Deadline Test
Test Summary
This test verifies that the PUT will accept an LCRD_X sent at the CREDIT_HP_TIMER deadline,
minus tLinkTurnAround (i.e., at 4999.50us after the end of the PUT’s Port Capabilities LMP).
Test Steps and Expected Results
1.
Examiner performs the same steps described in TD7.1 (Link Bring-Up Test) to bring the
link to U0, but transmits all LCRD_X responses at [CREDIT_HP_TIMER – tLinkTurnAround].
