How can I invert the polarity of the serial lines on the 10GBASE-R PHY? - How can I invert the polarity of the serial lines on the 10GBASE-R PHY? Description On the 10GBASE-R PHY, there are no external pins or registers to enable the inversion of the tx or rx serial lines. Resolution The TX and RX polarity inversion is available and controlled with a parameter within the source RTL. After generating the PHY with the Megawizard, locate the file "sv_xcvr_10gbaser_native.sv" and search of the lines below. localparam RX_POLARITY_INV = "invert_disable"; localparam TX_POLARITY_INV = "invert_disable"; The valid parameters are "invert_enable" or "invert_disable" The default value is "invert_disable". To invert the polarity, simply change the parameter to "invert_enable". Custom Fields values: ['novalue'] Troubleshooting novalue False ['novalue'] ['FPGA Dev Tools Quartus II Software'] novalue 12.0 ['Programmable Logic Devices'] ['novalue'] ['novalue'] ['novalue']