Why doesn't my Quartus II XCVR_RX_LINEAR_EQUALIZER_CONTROL QSF assignment have any effect on the Stratix V GX equalizer in Quartus II software versions 12.1 and 12.1sp1. - Why doesn't my Quartus II XCVR_RX_LINEAR_EQUALIZER_CONTROL QSF assignment have any effect on the Stratix V GX equalizer in Quartus II software versions 12.1 and 12.1sp1. Description Due to a bug in Quartus® II software versions 12.1 and 12.1sp1, the XCVR_RX_LINEAR_EQUALIZER_CONTROL QSF assignment may not have an effect on the Stratix® V GX equalizer. Resolution To work around this issue you should write the equalization value through the Avalon® Memory Mapped interface. Alternatively you can install the following appropriate patch. Quartus II software version 12.1 Quartus II software version 12.1 patch 0.38 for Windows (.exe) Quartus II software version 12.1 patch 0.38 for Linux (.tar) Quartus II software version 12.1 patch 0.38 Read Me file (.txt) Quartus II software version 12.1 SP1 dp6 Quartus II software version 12.1 SP1 dp6 patch f for Windows (.exe) Quartus II software version 12.1 SP1 dp6 patch f for Linux (.tar) Quartus II software version 12.1 SP1 dp6 patch f Read Me file (.txt) This issue will be fixed in a future version of the Quartus II software. Custom Fields values: ['novalue'] Troubleshooting novalue False ['novalue'] ['FPGA Dev Tools Quartus II Software'] novalue 12.1 ['Stratix® V FPGAs', 'Stratix® V GS FPGA', 'Stratix® V GX FPGA'] ['novalue'] ['novalue'] ['novalue']