LOW POWER AND TIMING ERROR MITIGATION CIRCUIT DESIGN BASED ON CLOCK GATING

Timing error is now getting increased attention due to the high rate of error-occurrence on semiconductors. Even slight external disturbance can threaten the timing margin between successive clocks since the latest semiconductor operates with high frequency and small supply voltage. To deal with a timing error, many techniques have been introduced. Nevertheless, existing methods that mitigate a timing error mostly have time-delaying mechanisms and too complex operation, resulting in a timing problem on clock-based systems and hardware overhead. In the proposed work a novel timing-error-tolerant method that can correct a timing error instantly through a simple mechanism is demonstrated. By modifying a clock in a flip-flop, the proposed system can recover a timing error without the loss of time in the clock-based system. Furthermore, in order to reduce power consumption in the stages were operation is not performed clock gating mechanism is used to reduce the unwanted transition. Look-Ahead Clock Gating (LACG) computes the clock enabling signals of each FF one cycle ahead of time, based on the present cycle data of those FFs on which it depends. It has however a big advantage of avoiding the tight timing constraints of earlier methods, by allotting a full clock cycle for the enabling signals to be computed and propagate to their gaters