Multi Channel DMA Intel® FPGA IP for PCI Express* User Guide

ID 683821
Date 10/06/2023
Public

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10.1.4.4. Eye Viewer

The Debug Toolkit supports the Eye Viewer tool that allows you to measure on-die eye margin.

The Eye Viewer tool:
  • Provides a pictorial representation of the eye for each channel, both in the subdivided (e.g., x8x8) and non-subdivided (e.g., x16) configurations. This feature is available in P-Tile debug toolkit only.
  • Provides information on the total eye height, total eye width and eye measurement information from the center of the eye to the four corners (left, right, top, bottom).
  • Uses fixed step sizes in the horizontal and vertical directions.
  • For P-Tile debug toolkit, Performs the eye measurement at the following bit error rates (BER):
    • 8.0 GT/s (Gen3) @ e-8, 100% confidence level
    • 16.0 GT/s (Gen4) @ e-9, 90% confidence level
    • 8.0 GT/s (Gen3) and 16.0 GT/s (Gen4) @ e-12, 95% confidence level
  • For F-tile debug toolkit, performs the eye measurement at BER = 1e-12, 95% confidence level.
Note: The Eye Viewer feature of the Debug Toolkit does not support independent error sampler for performing eye margining. The eye margining is performed on the actual data path. As a result, the eye margining may produce uncorrectable errors in the data stream and cause the LTSSM to go to the Recovery state. You may mask out all errors (example AER registers) while performing the eye margining and reset all error counters, error registers etc. after margining is completed.