why nand gate only used as driving cell and load on input and output ports?

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gangadharn

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Hi,

Today, one of friend ask me below question.
why nand gate only used as driving cell and load on input and output ports?

As per my understanding : There is no hard rule of using only nand gate. I have practice of using Buffer/AND/CTB cells as driving cell and set_load. I think why nand cells? answer is this is one of the slowest cells (Faster compare to Nor of same size). Other then this I don't see anything.

Let me your views on this question.

Gangadhar Naik
 

What specific application are you talking about? When is the NAND gate used as driving cell and load on input/output ports? Is this during standard cell characterization?
 

These command are SDC's commands get used in setting up environment for Static Timing Analysis and Physical design. Application of design you can consider generic.
 

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