Agilent Technologies J-BERT N4903B Instrukcja Użytkownika Pobierz pdf (Strona 19)

Table 23. Speciﬁcations for tunable loop bandwidth

Tunable loop bandwidth

500 kHz to 12 MHz for data rates

1.46 Gb/s to 12.5 Gb/s

100 kHz to 4 MHz for data rates

1 Gb/s to 1.46 Gb/s

Loop bandwidth accuracy 10% typical (at transition density 50%)

Transition density

compensation

25% to 100%. The CDR can

automatically detect the transition

density of the incoming data pattern

and compensates the loop bandwidth

accordingly.

Tracking range (SSC) +0.05% to -0.55% (5500 ppm)

deviation of data rate. User can

disable/enable SSC tracking. Loop

bandwidth > 1 MHz and medium or

max peaking enabled

Jitter peaking Three customer selectable values

between 0 and 3 dB; see frequency

response in Figure 27

Fine adjust Manual adjustment -1.0 to + 1.0 of

CDR settings to minimize CDR output

jitter

Compliant CDR settings PCIe

, SATA, FC, FB-DIMM, CEI,

GE,10 GbE, XAUI, XFP/XFI, SONET

OC-48/192 (see Table 23). User can

add own CDR settings

Relax time < 1 sec typical

Error Detector Speciﬁcations

Loop

bandwidth

(MHz)

Tunable loop bandwidth

Data rate

(Gb/s)

12.511.5

1.461.0

0.5

0.1

4.0

7.5

12.0

Figure 26. CDR loop bandwidth

Figure 27. Three selectable frequency response settings. The example

shows JTF loop bandwidth of 900 kHz and 0 dB, 1.2 dB, 2.8 dB peaking

Table 24. Compliance settings for CDR

Standard Revision Data rate (Gb/s) JTF loop bandwidth (MHz) Jitter peaking (dB) SSC possible

PCIe 1.0

1.1

2.0

3.0

2.5

5.0

8.0

1.5

0.9

TBD

Yes

SATA I

III

1.5

3.0

6.0

0.9, 3.0

1.8, 6.0

TBD

1.3

1.7, 1.8

TBD

Yes

FB-DIMM 1

3.2, 4.0, 4.8

4.8, 6.4, 8.0, 9.6

0.9 Yes

Fibre Channel 1

1.063

2.125

4.25

8.5

10.518

0.638

1.275

2.55

4.0

0 No

CEI 6.0

11.0

6.0

11.0

4.0 (fbaud/1667)

8.0 (fbaud/1667)

0.1

1 GbE 1.25 4 0 No

10 GbE 10.312 4 0 No

10 GbE XAUI 3.125 1.875 0 No

SONET/SDH OC-48/STM-16

OC-192/STM-64

9.953 4 0 No

XFP/XFI

9.95

RX: 8.0

TX: 4.0

0.1

1. The standard allows 11 MHz to 22 MHz.

2. CEI standard allows data rates of 4.976 to 6.375 Gb/s and 9.95 to 11.1 Gb/s.

3. XFP/XFI standard allows data rates of 9.95 to 11.2 Gb/s.

20 dB/decade

1 2 ... 14 15 16 17 18 19 20 21 22 23 24 25 26

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