Can timing violations for the pif_interface_sel signal be safely ignored for the Stratix V and Arria V GZ device transceiver Reconfiguration Controller when compiled in Quartus II software, version 12.1? - Can timing violations for the pif_interface_sel signal be safely ignored for the Stratix V and Arria V GZ device transceiver Reconfiguration Controller when compiled in Quartus II software, version 12.1? Description Hold time violations for the pif_interface_sel signal can be safely ignored for the Stratix® V GX and Arria V GZ device reconfiguration controller when compiled in Quartus® II Software version 12.1. However, setup violations must be resolved. Resolution Due to a bug in the Quartus II software version 12.1, an extraneous false path exception was introduced in the alt_xcvr_reconfig.sdc file. The false path exception is shown below. set_false_path -from {*|alt_xcvr_reconfig_basic:basic|sv_xcvr_reconfig_basic:s5|pif_interface_sel} This exception needs to be replaced with the SDC constraint below. if { [string equal "quartus_sta" $::TimeQuestInfo(nameofexecutable)] } { # Sets a False path for hold time violations on the pif_interface_sel set_false_path -from {*|alt_xcvr_reconfig_basic:basic|sv_xcvr_reconfig_basic:s5|pif_interface_sel} -hold } Quartus II Software versions before and after 12.1 do not contain the above exception, but the new constraint can be applied to remove all hold violations of the pif_interface_sel signal from being reported in TimeQuest. This problem will be fixed in a future version of the Quartus II software. The following recommendations can also be used to help meet setup pif_interface_sel signal timing. For slower speed grade devices consider using a 100MHz instead of a 125MHz clock to drive the mgmt_clk_clk signal on the Reconfiguration Controller. Use multiple Reconfiguration Controllers in the design. This minimizes the fanout of the pif_interface_sel signal which helps in routing congestion for the design. For example, instead of using a single Reconfiguration Controller to drive all channels in a device you can try using one Reconfiguration Controller per transceiver six-pack. 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 GT FPGA', 'Stratix® V GX FPGA'] ['novalue'] ['novalue'] ['novalue']