i A PHYSICAL IMPLEMENTATION WITH CUSTOM LOW POWER ...

3.3.2 Calculation of Fall Power
Figure 3-7: HSPICE Rise Power Calculation command
Fall Power in the context of the delay element is defined as the amount of power consumed when
the D input signal makes a transition from a logic high to a logic low value. Fall power is
calculated from the point where the Dinput begins to fall at t=0 to t= ∆. As the delay elements
does not delay the falling edge, the measurement needs to be done only from t=0 to t=∆. The
HSPICE command for measuring the rise power and fall power are identical except for the time
value. Figure 3-8 shows the fall power measurement window.
Din
Delayed-Out
Settling time
Measurement Window
Figure 3-8: Fall Power Measurement window
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