09HSI-S042-R0-CHT datasheet(41/71 Pages) HIROSE

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Signal Integrity Report – IT3 (17mm)

Page 41

Timing Jitter (ps)

Eye Height (mV)

Data Rate

(Gbps)

IT3

Base Case 1

ΔIT3

ΔIT3 (%)

IT3

Base Case 1

ΔIT3

ΔIT3 (%)

3.125

20.21

15.08

5.13

1.60

1248.86

1314.30

-65.44

-4.98

17.17

11.80

5.37

2.69

1044.57

1131.88

-87.31

-7.71

6.25

14.82

11.64

3.18

1.99

927.44

1024.59

-97.15

-9.48

15.1

10.69

4.41

646.06

773.19

-127.13

-16.44

Table 13 Comparison of eye height and timing fuzz between full channel and Base Case 1 at the receiver’s input with 14 FEXT

Timing Jitter (ps)

Eye Height (mV)

Data Rate

(Gbps)

IT3

Base Case 2

ΔIT3

ΔIT3 (%)

IT3

Base Case 2

ΔIT3

ΔIT3 (%)

3.125

20.21

20.00

0.21

0.07

1248.86

1243.00

5.86

0.47

17.17

14.81

2.36

1.18

1044.57

1042.36

2.21

0.21

6.25

14.82

14.65

0.17

0.11

927.44

940.69

-13.25

-1.41

15.1

12.46

2.64

646.06

686.70

-40.64

-5.92

Table 14 Comparison of eye height and timing fuzz between full channel and Base Case 2 at the receiver’s input with 14 FEXT

3.2.5.2 50% density pin assignment

Figure 25, Figure 26 and Figure 27 show the optimized tap coefficients for the maximum eye

opening at various data rates for the channel without the connector and connector vias (Base Case

1), for the channel without the connector only (Base Case 2), and for the full channel.

Figure 68 - Figure 72 show the eye diagrams at receiver inputs for various data rates (5, 6.25, 10

12.5 and 20Gbps) with via transition in the 16th PCB routing layer and with 6 FEXT.

Table 18 and Table 19 summarize the corresponding results for the eye diagram and their

comparison with Base Case 1 and Base Case 2.

Data Rate

(Gbps)

PRE-

CURSOR[3]

PRE-

CURSOR[2]

PRE-

CURSOR[1]

MAIN

CURSOR

POST-

CURSOR[1]

POST-

CURSOR[2]

POST-

CURSOR[3]

-----

0.8747

-0.1253

-----

6.25

-----

-0.0359

0.8278

-0.1363

-----

-0.0694

0.7635

-0.1670

-----

12.5

-----

-0.0967

0.7207

-0.1827

-----

0.0297

-0.1562

0.6129

-0.1839

-0.0174

-----

Table 15 Base case 1: optimum tap setting coefficients for center pair 4 of IT3-17mm connector for 50% pin density configuration

Data Rate

(Gbps)

PRE-

CURSOR[3]

PRE-

CURSOR[2]

PRE-

CURSOR[1]

MAIN

CURSOR

POST-

CURSOR[1]

POST-

CURSOR[2]

POST-

CURSOR[3]

-----

0.8611

-0.1389

-----

6.25

-----

-0.0435

0.8099

-0.1466

-----

-0.0826

0.7424

-0.1751

-----

12.5

-----

-0.1216

0.6997

-0.1788

-----

-0.0170

0.0521

-0.1888

0.5552

-0.1699

-0.0170

-----

Table 16 Base case 2: optimum tap setting coefficients for center pair 4 of IT3-17mm connector for 50% pin density configuration

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