[XSIM 43-3225] Cannot find design unit xil_defaultlib.simple_ram

2015.03 vivado，编写了一个仿真vivado simple_ram_dual IP核，想检测下伪双口ram的实际功能。结果报了如下错误

[XSIM 43-3225] Cannot find design unit xil_defaultlib.simple_ram_tb in library work located at xsim.dir/work.

直接说结果，就是忘了写一个输入信号，即input write_en;

额。。。这次的错误跟上次的类似，就是它报的错误很复杂而且迷惑人。以为十多难的问题，上网搜说是库函数编译库什么的，其实都不是。就是代码少写了什么或者没写位数之类的，语法也不报错，就是仿真时报这些乱七八糟的错误，所以大家看到这些错误时别总想着软件的问题，很可能就是自己的代码哪里写错啦

又发现了这个问题，这次以为是IP核的原因，结果是打个比方，

always@（write）

begin

end

reg write;

always@（write）

begin

end

上述就错了，因为ｒｅｇ　ｗｒｉｔｅ应该放在第一个ａｌｗａｙｓ语句块上面，太低级的错误啦！！！！虽然举个例子有语法错误，但我只是想记录下我的错误方式。代码写多了太容易乱啦，而ｖｉｖａｄｏ语法要求又高

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[XSIM 43-3225] Cannot find design unit xil_defaultlib.simple_ram_tb in library work located at xsim.

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