In Xpower 7.1i, when I calculated power of a 2-input AND gate, it gave me the total power as 120mW. For a 32bit carry skip adder, it is 124mW, which is totally wrong in my opinion as a 32 bit adder will have many transistors when compared to AND gate. What might be the problem in this. Can anyone, suggest me the correct way of calculating power in Xpower from Xilinx ISE 7.1i
120mW for a NAND gate cannot be correct. Please note that any CAD tool's output is as good as the kind of inputs it receives. In order to calculate power, the tool will need some technology parameters as well as some specifics about the circuit itself (gate sizes, etc). Finally, the input vectors which you provided will also be important, provided the tool is estimating dynamic power. Please check what inputs you are providing as well as what the tool is estimating.
power consumed in individual circuit cant be calculated in xilinx it always gives power consumed by whole chip . better to go for full custom design in order to get optimum power consumption result
thanks
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