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DS160PT801X16EVM: How to fine tune in GUI and definitions

kao ken
Prodigy 10 points
Part Number: DS160PT801X16EVM

Tool/software:

Hi Tech team ,

Here is Sparkle.Co

We have installed the GUI successfully and are able to connect to the EVM board. However, we are not sure how to fine-tune the configuration or how to measure the eye pattern. Is there any possibility that you could provide a live stream to teach us how to tune these parameters in the GUI and explain the definitions of those parameters? Since we do not have any technical support available here in Taiwan, we would greatly appreciate it if you could support us with a live stream or remote session.

  • 0
    TI__Mastermind 18245 points

    Hi Ken,

    We unfortunately do not have availability this week for a call, but I can give you feedback on your points:

    kao ken said:
    However, we are not sure how to fine-tune the configuration

    The retimer's signal conditioning systems (CTLE, DFE, CDR, etc.) are automatically controlled and optimized. So manual "fine tuning" usually leads to worse results than the automatic control and we only do a limited amount of it in special cases. Generally speaking, if the retimer is configured with the correct EEPROM to allow the PCIe link to be formed correctly and there are no protocol issues, then the SI performance observed is close to the limit of what is possible in the setup.

    kao ken said:
    or how to measure the eye pattern

    The GUI has an "eye monitor" page that provides some eye diagram information. When the link is up, you can select a retimer, select a channel, and run "single capture" or "continuous capture" to estimate the eye diagram at the retimer transmitters. However, the most generally useful eye diagram is at the final PCIe receiver, such as the CPU receiver eye diagram, so if you have the appropriate software from Intel or AMD then that can be run on the platform side separately from the retimer or the retimer GUI.

    Best,

    Evan Su