Tuesday, 1 December 2015

CLOCK GATING

CLOCK GATING:

Clock gating is a well-known technique to reduce chip dynamic power. 
Recent  clock gating techniques based on ACG(Adaptive Clock Gating) and instruction level clock gating. 
clock gating technique reduces not only switching activity of functional blocks in IDLE state but also dynamic power in running state. 
Clock gating is a popular technique used in many synchronous circuits for reducing dynamic power dissipation. 
Clock gating saves power by adding more logic to a circuit to prune the clock tree.
The clock -gating is one of the effective logic in RTL and architectural power reduction.
By combining(AND gate) the clock with a gate-control signal, clock gating essentially disables the clock to an IP core when that IP is not used, avoiding power dissipation due to unnecessary charging and discharging of the unused circuits. 

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