Forum Discussion

HBhat2's avatar
HBhat2
Icon for Contributor rankContributor
6 years ago

Experiment with S-10 Transceiver IO Terminations

Hi, I am performing some experiment with S-10 SoC Dev kit (L-tile). I am using FMC loopback cards to check the behavior of SERDES so as to use for my final requirement. My goal is to connect a dev...
CheepinC_altera's avatar
CheepinC_altera
Icon for Regular Contributor rankRegular Contributor
6 years ago

Hi HPB,

Regarding the TX analog settings, apart from the VOD and pre-emphasis, there is another parameter - slew rate control. However, based on my understanding, generally VOD and pre-emphasis would have more significant impact to signal integrity. In your case, I think you would need to look into using matching impedance since the auto-sweep is unable to get any acceptable BER for you. Sorry for the inconvenience.

Please let me know if there is any concern. Thank you.

Best regards,

Chee Pin

HBhat2's avatar
HBhat2
Icon for Contributor rankContributor
6 years ago

Hi Chee Pin,

Thank you for hinting towards slew rate. Let me check that as well.

I think this is one of the aspect which I missed. In all my previous tests, Slew rate control was set to '0'. Just now I gone through the XCVR user guide and found that Slew rate control is set o 5 for Gen2 PIPE and Gen3 PIPE.

Also, I want to know the definition of values of slew rate control ( 0 to 5). i.e. what is the meaning of slew rate control = 0, 1 etc..

With regards,

HPB

  • CheepinC_altera's avatar
    CheepinC_altera
    Icon for Regular Contributor rankRegular Contributor
    6 years ago
    Hi, Regarding the slew rate control settings, as I understand it from the user guide, 0 = slowest and 5 = fastest. There seems to be no specific specs in term of seconds in the user guide. Thank you. Best regards, Chee Pin