about latch using nor gates

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surerdra

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i implemented vhdl program for one of the digital design, here latch (using nor gates) is one of the components, while i simulate the output of latch is
undefined--u--, if i plase some delay(after x ns) in inputs of latch the out put is came, but the hardware didn't consider this type(after x ns) of commands.

if i check that latch component individually the out put came with out any delay at inputs, but while i using that component in my program the output not came with out delay, i add some dalay using buffrs also but i didnt get, what i do?
 

'U' means uninitalised, so you havent set a signal somewhere.

Why not post the code, and we can have a look?
 

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