Article ID: 000085774 Content Type: Troubleshooting Last Reviewed: 11/15/2011

Half-Duplex Mode Post Collision Issues

Environment

  • Quartus® II Subscription Edition
  • Ethernet
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    Critical Issue

    Description

    When the MAC function operates in half-duplex mode, these issues are observed after collisions:

    • The MAC function continuously sends data out through the MII even when you do not send any data to the MAC function.No retransmit frame is available on the MAC transmit datapath when collision happens on half-duplex 10-Mbps MAC variant.The MAC function fails to copy the start-of-packet (SOP) of the subsequent frame after the retransmit frame into the retransmit buffer.

    This issue affects variants of MAC function operating in half-duplex mode.

    Resolution

    No workaround.This issue is fixed in version 11.0 of the Triple-Speed Ethernet MegaCore function.

    Related Products

    This article applies to 1 products

    Intel® Programmable Devices