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  1. Hello, I'm trying to follow the tutorial posted here: https://reference.digilentinc.com/nexys4-ddr:gsmb I got as far as "Generating Bit File" step. This step fails with the following message in the console: ERROR: [Drc 23-20] Rule violation (NSTD-1) Unspecified I/O Standard - 1 out of 50 logical ports use I/O standard (IOSTANDARD) value 'DEFAULT', instead of a user assigned specific value. This may cause I/O contention or incompatibility with the board power or connectivity affecting performance, signal integrity or in extreme cases cause damage to the device or the components to which it is connected. To correct this violation, specify all I/O standards. This design will fail to generate a bitstream unless all logical ports have a user specified I/O standard value defined. To allow bitstream creation with unspecified I/O standard values (not recommended), use this command: set_property SEVERITY {Warning} [get_drc_checks NSTD-1]. NOTE: When using the Vivado Runs infrastructure (e.g. launch_runs Tcl command), add this command to a .tcl file and add that file as a pre-hook for write_bitstream step for the implementation run. Problem ports: sys_clock.ERROR: [Drc 23-20] Rule violation (UCIO-1) Unconstrained Logical Port - 1 out of 50 logical ports have no user assigned specific location constraint (LOC). This may cause I/O contention or incompatibility with the board power or connectivity affecting performance, signal integrity or in extreme cases cause damage to the device or the components to which it is connected. To correct this violation, specify all pin locations. This design will fail to generate a bitstream unless all logical ports have a user specified site LOC constraint defined. To allow bitstream creation with unspecified pin locations (not recommended), use this command: set_property SEVERITY {Warning} [get_drc_checks UCIO-1]. NOTE: When using the Vivado Runs infrastructure (e.g. launch_runs Tcl command), add this command to a .tcl file and add that file as a pre-hook for write_bitstream step for the implementation run. Problem ports: sys_clock. It seems I'm missing some configuration commands which normally go in the *.xdc file, but the tutorial did not specify that an *.xdc file is needed. I'm running Vivado 2014.4 and the board is PB200-292, rev C. Has anybody seen this before?