kc705与iostandard冲突

您确定您的约束文件在您的项目中吗？
看看日志。
注意任何早期的消息。
是否有另一个xdc约束文件覆盖了您发布的文件？
Austin Lesea主要工程师Xilinx San Jose



以下为原文

Are you sure your constraints file is in your project?
 
Look at the log.  Pay attention to any earlier messages.  Is there another xdc constraints file over-riding the one you posted?
Austin Lesea
Principal Engineer
Xilinx San Jose

这些工具（正确地）告诉您，您的设计中有一个顶级信号没有应用IOSTANDARD（也不是PACKAGE_PIN）。
这使得工具可以选择任何位置并使用“DEFAULT”IOSTANDARD作为引脚。
DRC将此标记为违规，因为将此设置中的设计放在电路板上通常是不合法的。
您的设计具有端口“clk_out”，在.xdc文件中没有相应的约束...
Avrum



以下为原文

The tools are telling you (correctly) that there is one top level signal from your design that you have not applied an IOSTANDARD (nor a PACKAGE_PIN) to. This lets the tools choose any location and use the "DEFAULT" IOSTANDARD for the pin. The DRC flags this as an violation, since it is generally not legal to put a design in this configuration on a board.
 
Your design has the port "clk_out" for which there is no corresponding constraints in the .xdc file...
 
Avrum

谢谢你的回答。
我解决了这个问题。
我正在考虑一个更复杂的解决方案，但有时候会发生这种情况。
介于两者之间我想问一下当我在kc705上声明系统时钟时发出的警告。
LED和系统时钟都在bank 33上，当我使用master xdc文件信息时，它会出错。
如果他们使用不同的IOstandard，为什么他们在同一个银行，为什么不接受主文件信息（时钟LVDS）？
你可能会看到我使用了“DIFF_SSTL15”并且它有一个警告：
[DRC 23-20]规则违规（PORTPROP-2）selectio_diff_term  - 端口clk_in_n具有无效的DIFF_TERM属性值。
对于目标架构，IOSTANDARD值DIFF_SSTL15不支持片上输入差分匹配。
DIFF_TERM属性值将被忽略。
如果某人给出正确的定义，这将非常有帮助。
提前致谢！



以下为原文

 
Thank you for the answers. I fixed the problem. I was thinking about a more complicated solution but ok sometimes this happens. 
 
in between I want to ask about a warning i'm having when I declare system clock on kc705. LEDs and system clock are both on bank 33 and when I use master xdc file info it gives error. if they use different IOstandard why they are on the same bank and why don't accept the master file info (LVDS for clock)? You may see that I used  " DIFF_SSTL15 " and it works with a warning:
 
[DRC 23-20] Rule violation (PORTPROP-2) selectio_diff_term - The port clk_in_n has an invalid DIFF_TERM property value. For the target architecture, IOSTANDARD value DIFF_SSTL15 does not support on-chip input differential termination. The DIFF_TERM property value will be ignored.
 
 
If some one give the correct definition this will be very helpful. 
 
Thanks in advance!