Why macros are designed till 5th Metal layer?

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saketsharma

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Say, I am working on block lebel (90 nm) and I want to place a macro in it.
This design is having maximum 7 metal layers.

Now my question is:
Q Why I am oly limited to use only 5 metal layers? Why can't I utilise all 7 metal layers?
 

I guess its because u reserve two metal layers for top level routing. Generally macros will be designed such that it could be reused. hence top level connection will not be defined in macro level.
 

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