Late Collision in Half-Duplex 10/100-Mbps Ethernet MAC - Late Collision in Half-Duplex 10/100-Mbps Ethernet MAC Description MAC function with 1000BASE-X/SGMII PCS may detect late collision when it is operating in 10/100-Mbps half-duplex mode. The external third party PYH and cables introduce latency in addition to the latency of the 1000BASE-X/SGMII PCS with embedded PMA. This issue arises when the total latency exceeds the 512-bit slotTime as defined in IEEE 802.3 Clause 4.4. This issue affects MAC function designs that contain 10/100/1000 Mbps Ethernet MAC with 1000BASE X/SGMII PCS operating in 10/100 Mbps half duplex mode. Resolution Use 10/100/1000 Mbps Ethernet MAC only with GMII/MII or RGMII for 10/100 Mbps half duplex mode operation.This issue is fixed in version 11.0 of the Triple Speed Ethernet MegaCore function. Custom Fields values: ['novalue'] Troubleshooting novalue True ['Ethernet'] ['FPGA Dev Tools Quartus II Software'] 11.0 10.0 ['Programmable Logic Devices'] ['novalue'] ['novalue'] ['novalue']