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some warnings about dc synthesis

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scaramouche

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hello, everybody,
i am new to here. When i run dc, i meet some warnings such as
"cell 'I_13' does not drive any nets", "port 'CI' is not connected to any nets,
and so on. it seems something wrong with nets. How can i fix it?
tks in advance.
 

that is because some ports are floating, connect nothing, so you must check your code, but sometimes, you neednt worry about it, for example, if you use adder in designware, this warning will appear too
 

i believe these warnings appears when you "check_design".

Based on these warnings, look at your RTL code. For example, you may have the ports floating in the RTL.

For the cells having floating pin, this may be because of your limited standard cell in your library.

For example, you cells has an O1 and O2 output pins, but only the O1 pin is being used. So, the O2 pin will be left floating.

Hope this helps.
 

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