信号已使用但从未分配

理解“默认值”和赋值之间的区别非常重要。
在这种情况下
对于“ram”数据类型，您已在声明中为它们指定了默认值。
实际上，因为
你没有以其他方式对他们进行任务，他们将始终保持这个价值（充当
ROM），因此你得到警告。
如果这是这些“ram”信号的预期行为
然后你可以忽略警告。
请注意，警告有点误导，因为您可能认为“默认值”可能
例如，意味着零，这是分配给既未分配的信号的值
也没有在宣言中提出。
实际上，“默认值”将是您给出的值
声明中的信号。
-  Gabor
-  Gabor



以下为原文

It's important to understand the difference between "default value" and assignment.  In the case
of your "ram" data types, you have given them default values in the declaration.  In effect, since
you have not otherwise made assignments to them, they will always keep this value (act as
a ROM) and therefore you get the warning.  If this is the expected behavior of these "ram" signals
then you can ignore the warnings.
 
Note that the warnings are a bit misleading in that you might think that "default value" might
mean for instance zero, which is the value assigned to signals which are neither assigned
nor initilized in the declaration.  In fact, the "default value" will be the values you gave the
signal in the declaration.
 
-- Gabor
-- Gabor

谢谢你的答案差异很大
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以下为原文

thank you vary much for your answer Gabor
 
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