AN 871: Quick Guide for Intel® Arria® 10 and Intel® Cyclone® 10 GX Transceiver High-Speed Link Tuning

ID 683449
Date 9/26/2018
Public

1.2. Sweeping Your Settings

  1. Capture the BER for 5 to 10 seconds for each setting. This is your initial equalization setting.
  2. If your initial equalization setting shows an acceptable BER, proceed to Optimizing Your Settings.
  3. If your initial equalization setting shows a high BER, use the Auto Sweep feature on the Advanced tab of the Transceiver Toolkit to sweep the RX settings in the following order (refer to the "Acceptable BER Example Values" table for the starting and ending sweep values):
    1. CTLE AC gain
    2. VGA up to a maximum of four (depending on the datarate)
    3. CTLE DC gain/EQ, increasing
  4. If the BER is now acceptable, proceed to Optimizing Your Settings.
  5. For the Intel® Arria® 10 device only, if the BER remains high, enable DFE trigger adaptation 3. If the BER is now acceptable, proceed to Optimizing Your Settings. If the BER remains high, disable DFE trigger adaptation.
  6. If the BER remains high, change the settings back to the initial equalization setting (as shown in ) and sweep the TX settings in the following order (refer to the "Acceptable BER Example Values" table for the starting and ending sweep values):
    1. TX Pre-emphasis Post-Tap 1
    2. TX VOD
    3. TX Pre-emphasis Post-Tap 2
    4. TX Pre-emphasis Pre-Tap 1
    5. TX Pre-emphasis Pre-Tap 2
  7. If the BER is now acceptable, proceed to Optimizing Your Settings.
  8. For the Intel® Arria® 10 device only, if the BER remains high, return to the initial TX analog settings shown above based on datarate, enable DFE trigger adaptation, and sweep the TX settings again as described in Step 6. If the BER is now acceptable, proceed to Optimizing Your Settings.
  9. If the BER remains high, follow the instructions in Optimizing for Crosstalk at High Datarates.
3 DFE is only available in Intel® Arria® 10 devices. All steps involving DFE usage mentioned in this chapter are only applicable to Intel® Arria® 10 devices, and not to Intel® Cyclone® 10 GX devices

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