新手请教一个问题，请大家帮忙，谢谢

只看该作者 · 2012-6-3 12:27

我用的ise10.1 写了一个很简单的程序老实现不了错误提示如下：

ERROR:Par:332 - The evaluation period for this evaluation software has expired. As stated in the guidelines of the
Evaluation Agreement, which was shipped to you along with the Evaluation CDs, this software will no longer operate.
We are eager to assist you as you conclude your evaluation of the Xilinx solution. Your local Field Applications
Engineer or salesperson is available to answer any questions or to assist you in the purchase of an annual software
license. You may also contact Xilinx directly at eval@xilinx.com
Thank you for evaluating the Xilinx solution. We appreciate your interest in Xilinx and we look forward to earning
your confidence and your business.
Process "Place & Route" failed

下面是verilog代码
module good(
cout,sum,ina,inb,cin
);
  output[3:0] sum;
  output cout;
  input[3:0] ina,inb;
  input cin;
  assign{cout,sum}=ina+inb+cin;
endmodule

我还试过其它的代码都是实现的时候提示这个错误不知道错在哪里了请各位高人指点下，小弟万分感激。