DS125BR820 Datasheet, PDF (51/62 Pages) Texas Instruments – Low-Power 12.5 Gbps 8-Channel Linear Repeater

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Typical Applications (continued)
DS125BR820
SNLS491B – JULY 2014 – REVISED FEBRUARY 2015
0.6
0.5
0.4
0.3
0.2
0.1
0
-0.1
-0.2
-0.3
-0.4
-0.5
-0.6
-0.2 -0.1 0 0.1 0.2 0.3 0.4 0.5 0.6 0.7 0.8 0.9 1.0 1.1 1.2
Unit Intervals
No Repeater Used
Composite Eye Height: 0.057 mV
Minimum Eye Width: 37.66 ps
Overall SigTest Result: Fail
Figure 45. PCIe Gen-3, Preset 7, Transition Eye
TL1 = 10 Inch 4-Mil FR4 Trace,
TL2 = 5 Inch 4-Mil FR4 Trace
No Repeater, 8 Gbps
0.6
0.5
0.4
0.3
0.2
0.1
0
-0.1
-0.2
-0.3
-0.4
-0.5
-0.6
-0.2 -0.1 0 0.1 0.2 0.3 0.4 0.5 0.6 0.7 0.8 0.9 1.0 1.1 1.2
Unit Intervals
DS125BR820 Settings: EQA = Level 4, VODA = Level 6
Composite Eye Height: 77.26 mV
Minimum Eye Width: 78.24 ps
Overall SigTest Result: Pass
Figure 46. PCIe Gen-3, Preset 7, Transition Eye
TL1 = 10 Inch 4-Mil FR4 Trace,
TL2 = 5 Inch 4-Mil FR4 Trace
DS125BR820, 8 Gbps
0.6
0.5
0.4
0.3
0.2
0.1
0
-0.1
-0.2
-0.3
-0.4
-0.5
-0.6
-0.2 -0.1 0 0.1 0.2 0.3 0.4 0.5 0.6 0.7 0.8 0.9 1.0 1.1 1.2
Unit Intervals
No Repeater Used
Composite Eye Height: 0.057 mV
Minimum Eye Width: 37.66 ps
Overall SigTest Result: Fail
Figure 47. PCIe Gen-3, Preset 7, Non-Transition Eye
TL1 = 10 Inch 4-Mil FR4 Trace,
TL2 = 5 Inch 4-Mil FR4 Trace
No Repeater, 8 Gbps
0.6
0.5
0.4
0.3
0.2
0.1
0
-0.1
-0.2
-0.3
-0.4
-0.5
-0.6
-0.2 -0.1 0 0.1 0.2 0.3 0.4 0.5 0.6 0.7 0.8 0.9 1.0 1.1 1.2
Unit Intervals
DS125BR820 Settings: EQA = Level 4, VODA = Level 6
Composite Eye Height: 77.26 mV
Minimum Eye Width: 78.24 ps
Overall SigTest Result: Pass
Figure 48. PCIe Gen-3, Preset 7, Non-Transition Eye
TL1 = 10 Inch 4-Mil FR4 Trace,
TL2 = 5 Inch 4-Mil FR4 Trace
DS125BR820, 8 Gbps
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