09-11-2015 10:24 AM
I'm having a problem interpreting GTY Ibert eye scan results. Attached are three scans:
1. Good eye scan: PRBS31, DFE=on (eye1.jpg)
Looks as expected.
2. PRBS31, DFE=off (eye4.jpg)
I cannot explain why the eye gets out of vertical borders.
3. Slow clock data pattern, DFE=on (eye2_slow_clock.jpg)
On the scope I see a low-jitter shape resembling sine wave. But Ibert eye scan produce this strange triangle shape.
10-16-2017 02:30 PM