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CAUSE: The SLPBK port of the specified gigabit transceiver block (GXB) receiver channel and the SRLPBK port of the specified GXB transmitter channel are tied to VCC, thus enabling both serial and reverse-serial loopback at the same time. This connection of the two ports at the same time to VCC is illegal.
ACTION: Modify the design to feed the SLPBK port of the GXB receiver channel and the SRLPBK port of the GXB transmitter channel from pins or logic. If you use the MegaWizard Plug-In Manager to instantiate the ALTGXB megafunction, the port names are rx_slpbk and tx_srlpbk; however, because the ALTGXB MegaWizard Plug-In Manager is being deprecated, Altera recommends using ALTGX MegaWizard Plug-In Manager instead.
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