A DATA-TRANSITION LOOK-AHEAD DFF CIRCUIT FOR STATISTICAL REDUCTION INPOWER-CONSUMPTION

A new data-transition look-ahead DFF (DL-DFF) that reduces the power c onsumption of CMOS LSI's is proposed. The power consumption is reduced in accordance with the data-transition probability, The main feature of the DL-DFF is that the clock signal is deactivated when there are n o data transitions. This reduces the power consumption when the data-t ransition probability is low. The power consumption of a DL-DFF is com pared to that of a conventional one by measuring a test chip fabricate d using a 0.25-mu m CMOS/SIMOX process. It is found that a DL-DFF cons umes less power than a conventional one when the data-transition proba bility is under 60%. For example, when the data-transition probability is 25%, it consumes 29% less power, Moreover, some suitable applicati ons of a DL-DFF are presented.