AR# 61134

QSGMII V3.2:Data mismatch or frame error seen with Example Test Bench Simulation when 3C Data is present in the Frame.

In QSGMII V3.2, when 3C Data is present in the Frame, data mismatches or frame errors are seen with Example Test Bench Simulation.

This happens due to incorrect logic in the K28P1_swapper_tb logic file of the example design.

The swap should happen only for K characters in the monitoring logic and should not take place for normal data.

However the swapper logic is not considering the special Character indication in the logic.

To resolve this issue, include the K character indication in the K28p1_swapper_tb file as below.

Change:

IS_K28P1 <= ((NOT DECODER_8B_DATA_IN(7)) AND (NOT DECODER_8B_DATA_IN(6)) AND

DECODER_8B_DATA_IN(5) AND DECODER_8B_DATA_IN(4) AND

DECODER_8B_DATA_IN(3) AND DECODER_8B_DATA_IN(2) AND

(NOT DECODER_8B_DATA_IN(1)) AND (NOT DECODER_8B_DATA_IN(0)));

To:

IS_K28P1 <= (DECODER_IS_K AND ((NOT DECODER_8B_DATA_IN(7)) AND (NOT DECODER_8B_DATA_IN(6)) AND

DECODER_8B_DATA_IN(5) AND DECODER_8B_DATA_IN(4) AND

DECODER_8B_DATA_IN(3) AND DECODER_8B_DATA_IN(2) AND

(NOT DECODER_8B_DATA_IN(1)) AND (NOT DECODER_8B_DATA_IN(0))));

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