Agilent Technologies DisplayPort Bedienungsanleitung PDF herunterladen (Seite 53)

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DisplayPort Test Implementation Group 53 Agilent J-BERT N4903B & 90000A/X/Q Series Sink Draft2

E. Appendix: ISI Adjustment Using De-emphasis

A de-emphasized signal can be used to fine tune ISI if the channel without de-emphasis measures an ISI

number above the target range.

Setup a De-emphasized Signal

Both the N4916B De-emphasis Signal Converter and the channel add method which combines data and

aux data can be used for this approach. The channel add method requires N4903B Opt. 002.

N4916B De-emphasis Signal Converter

Figure 54: Setup with N4916B De-Emphasis Signal Converter

The N4916B De-emphasis Signal Converter acts as front-end for the J-BERT N4903B. It is connected to

the J-BERT N4903B using the N4915A-010 connection cable kit and is controlled by J-BERT via an

USB connection. The unused data out bar connector needs to be terminated.

Before first use the timing between J-BERT N4903B and N4916B needs to be adjusted:

• Activate N4916B de-emphasis signal converter

Figure 55: Activate N4916B and prepare for Timing Adjustment

• Perform timing adjustment for N4916B

a. Press “Load Calibration Setting” once

b. Change data rate to 7Gb/s for a N4903B-C07 or 12.5Gb/s for a N4903B-C13

c. Connect main clock out normal to ED clock in

d. Select Input Timing Setup to 1. Do NOT press “Load Calibration Setting”

e. Perform Auto Align of ED

f. Start error count by pressing the start button once and wait until the accumulation is finished.

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Agilent Technologies DisplayPort Bedienungsanleitung Seite 53