i A PHYSICAL IMPLEMENTATION WITH CUSTOM LOW POWER ...

Figure 6-27: Layout of a 80fF drive buffer
The Liberty Format description of a delay element includes its rise power, fall power, cell
rise delay, cell fall delay, rise transition time, fall transition time, leakage power during ON state,
leakage power during OFF state. The Synopsys Liberty Format terminologies are described
below.
Rise Power
Energy Consumed by the cell when the input makes a transition from a logic low to a
logic high value.
Fall Power
Energy Consumed by the cell when the input makes a transition from a logic high to a
logic low value.
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