Tool/software:
Hi FPD Link team,
Here are some questions from my customer, please help to answer, thanks~
1. My customer system is UB933-UB934, they want to test Eye-Diagram, could you please tell us what we need to care about?
2. They wonder if our UB933 has output driver slew rates limited? What are the maximum slew rates for dV/dt and dI/dt？
3. Do we have recommended slew rate configuration considered to meet EMC performance?
Best Regards,
Jack
Hi Jack,
1. My customer system is UB933-UB934, they want to test Eye-Diagram, could you please tell us what we need to care about?
It's typically recommended to measure the eye diagram with reference to the deserializer specifications. Deserializer specification table will provided input jitter allowances and eye open margins. The eye diagram may differ across the operating range of the device such as temperature.
Under temp high/low conditions you may see variation primarily in the following items:
- Equalizer performance (gain) changes
- Cable performance especially IL can change slightly
The above two items can have an influence on the link margin therefore, it's a good idea to evaluate the device performance across anticipated operating temp
2. They wonder if our UB933 has output driver slew rates limited? What are the maximum slew rates for dV/dt and dI/dt？
UB933 does not have configurations available for the FPD-Link output. The FPD-Link output will be dependent on the mode selected and PCLK provided.
3. Do we have recommended slew rate configuration considered to meet EMC performance?
For the UB933 and UB934, SSCG is an available configuration on the UB934 via the following register.
This would apply SSC to the back channel of the UB934 but, not the UB933.
