Cyclone IV GX transceiver Rx does not support a clock tolerance of /- 500 PPM or /- 1000 PPM - Cyclone IV GX transceiver Rx does not support a clock tolerance of /- 500 PPM or /- 1000 PPM Description Cyclone IV GX transceiver Rx does not support a clock tolerance of /- 500 PPM or /- 1000 PPM. Resolution In the ALTGX MegaWizard Plug-In Manager, select a clock tolerance other than /- 500 PPM or /- 1000 PPM in What is the acceptable PPM threshold between the receiver CDR VDO and the receiver input reference clock? on the PLL/Ports tab of the Parameter Settings page. Custom Fields values: ['novalue'] Troubleshooting novalue True ['novalue'] ['FPGA Dev Tools Quartus II Software'] novalue 9.1.2 ['Cyclone® IV FPGAs'] ['novalue'] ['novalue'] ['novalue']