Importance

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Abstract

A power saving hierarchical clock gating circuit includes a first level clock gate, a plurality of second level clock gates connected to the first level clock gate, and a plurality of third level clock gates for selectively providing a clock signal to a functional block. Each third level clock gate is connected between a second level clock gate and a register, or other low level device, of the functional block for selectively providing the clock signal to the register. Accordingly, the clock signal is conveyed from the first level clock gate through a second level and a third level clock gate to a register when the corresponding first, second, and third level clock gates are activated by associated decision logic.

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First Claim