AR# 39756

描述

解决方案

Near-end PMA Loopback:

The near-end PMA loopback for GTH Transceivers is currently not supported by the IBERT tool, but it can be selected by setting the followingattributes manually through the "DRP Settings" tabin IBERT:

It is important to note here thatthough PMA_LPBK_CTRL_LANE<n>[1:0] attributeis perGTH lane,the SLICE_CFG and LANE_AMON_SEL are not lane specific attributes,but affect all four lanes in a Quad. Therefore, all four transceivers in aQuadare placed in near-end PMA loopback mode when these attributes are set to these values. This feature is to be addressed in a future version of the IBERT tool.

Near-end PCS Loopback:

The near-end PCS loopback can be selected from the pull-down menu in the IBERT tool. IBERT sets the following bit to enable the near-end PCS loopback when selected from the menu.

Far-end PMA Loopback:

Far-end PMA loopback is supported in GTH Transceivers, but far-end PCS loopback is not supported. The"Far-end PCS" in the IBERT tool is incorrectly labeled (it is actually far-end PMA loopback), and selecting this option only sets the PCS_MODE<n>[15] bit to 1'b1. The other attribute PCS_RESET<n>[1] is not set correctly either.This feature is to be addressed in a future revision of the IBERT tool.

The far-end PMA loopback can be selected correctly by setting the above attributes manually through the "DRP Settings" tab in IBERT.

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