gregq

Getting started with Vivado

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I did the "Getting started with Vivado" tutorial. When I went to generate a bitstream I got two error. They are:

ERROR: [DRC NSTD-1] Unspecified I/O Standard: 2 out of 2 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: clk, and led.
ERROR: [DRC UCIO-1] Unconstrained Logical Port: 2 out of 2 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: clk, and led.
 

I have attached the xdc file. I has been edited per the tutorial instructions. I don't know why the IOSTANDARD is DEFAULT in the errors. The XDC file displayyed in Vivado shows IOSTANDARD LVCMOS33.

Nexys-4-DDR-Master.xdc

Edited by gregq
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Hello,

Can you please send me your project sources ?. In this way it will be easier for me to find out what causes this problems. 

cheers,

Vanca Bogdan

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