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

ID 683821
Date 2/11/2023

A newer version of this document is available. Customers should click here to go to the newest version.

Document Table of Contents 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.
  1. In the System Console Tools menu option, click on Eye View Tool.
    Note: The per-lane information under the Eye Viewer tab corresponds to the physical lanes.
    Figure 65. Opening the Eye Viewer
  2. This will open a new tab Eye View Tool next to the Main View tab. Choose the instance and channel for which you want to run the eye view tests.
    Figure 66. Opening the Instance and Channel
  3. For P-Tile debug toolkit, set the Eye Max BER. Two options are available: 1e-9 or 1e-12.
  4. Click Start to begin the eye measurement for the selected channel.
  5. The messages window displays information messages to indicate the eye view tool's progress.
    Figure 67. Eye View Tool Messages
  6. Once the eye measurement is complete, the eye height, eye width and eye diagram are displayed.
    Figure 68. Sample Eye Plot [for BER = 1e-9 in P-Tile debug toolkit]
    Figure 69. Sample Eye Plot [for BER = 1e-12 in P-Tile debug toolkit]
    Note: Full eye plot is not drawn for BER = 1e-12.
    Note: For P-Tile debug toolkit eye margin mask, refer to the P-Tile Avalon Streaming Intel FPGA IP for PCI Express User Guide