Why are there periodic glitches on the transceiver Tx pins when using F-tile PMA/FEC Direct PHY IP in GPON mode with single-width transfer? - Why are there periodic glitches on the transceiver Tx pins when using F-tile PMA/FEC Direct PHY IP in GPON mode with single-width transfer? Description Due to a problem in the Quartus® Prime Pro Edition Software version 23.3 and earlier, when you instantiate PMA/FEC Direct PHY IP in GPON mode with signal-width transfer, you may see periodic glitches on the transceiver Tx pins. Resolution To work around this problem in hardware, perform the following steps : Navigate to <your ip directory>/. Locate dphy_f_tx_dsk_gen.sv and change the following lines : From genvar l; for(l=0;l<LANES;l=l+1) begin:lane assign o_data[l*80+:80] = DOUBLE_WIDTH_ON ? {i_data[l*80+79], tx_dsk_pulse, i_data[l*80+:78]} : {i_data[l*80+79 : l*80+37], tx_dsk_pulse, i_data[l*80+:36]}; end : lane To genvar l; for(l=0;l<LANES;l=l+1) begin:lane assign o_data[l*80+:80] = DOUBLE_WIDTH_ON ? {i_data[l*80+79], tx_dsk_pulse, i_data[l*80+:78]} : {i_data[l*80+79 : l*80+37], 1'b0, i_data[l*80+:36]}; end : lane This problem has been fixed starting from the Quartus® Prime Pro Edition Software 24.1. Custom Fields values: ['novalue'] Troubleshooting 14020053486 False ['F-Tile PMA/FEC Direct PHY IP'] ['FPGA Dev Tools Quartus® Prime Software Pro'] 24.1 23.3 ['Agilex™ 7 FPGAs and SoCs'] ['novalue'] ['novalue'] ['novalue']