One Stop Systems
OSS-PCIe-HIB25x8| 20
3.2
LED Configuration Explanation
D17
D19
D18
D20
Indication
0
0
0
0
No valid signal from root or endpoint
0
0
0
1
NA
0
0
1
0
Root is sending valid training signals on either lane 0 only (x1) or lanes 0-3 (x4) to the
target; no valid signal coming from endpoint.
0
0
1
1
Root is x8 and is sending valid training signals on lanes 0-7 to the root; no valid signal
coming from endpoint.
0
1
0
0
NA
0
1
0
1
NA
0
1
1
0
NA
0
1
1
1
NA
1
0
0
0
Endpoint is sending valid training signals on either lane 0 only (x1) or lanes 0-3 (x4) to the
root; no valid signal coming from root.
1
0
0
1
NA
1
0
1
0
Valid signal levels from both root and endpoint on either lane 0 only (x1) or lanes 0-3 (x4)
1
0
1
1
Endpoint is sending valid signals on either lane 0 only (x1) or lanes 0-3 (x4) to the root,
but root is sending valid signals on lanes 0-7 (x8) (root and endpoint can’t agree on lane
width)
1
1
0
0
NA
1
1
0
1
NA
1
1
1
0
Root is sending valid signals on either lane 0 only (x1) or lanes 0-3 (x4) to the endpoint,
but endpoint is sending valid signals on lanes 0-7 (x8) (root and endpoint can’t agree on
lane width)
1
1
1
1
Valid signal levels from both root and endpoint on lanes 0-7 (x8)
