Pwr gating vs CLK gating

本文探讨了两种关键的低功耗设计技术:Powergating和Clockgating。Powergating通过断开非活动区域的电源供应来减少泄漏功率,而Clockgating则通过控制时钟路径上的切换活动来降低动态功率。文章详细介绍了这两种技术的实施方法,包括使用Header和Footer开关、隔离单元、状态保留触发器(SRFFs)、门级或锁存器或FF基时钟门控单元。

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Power gating is used for reducing LEAKAGE POWER by switching off power supply to the non operational power domain of the chip during certain mode of operation. Header and footer switches, isolation cells and state retention flip flips (SRFFs) are used for implementing power gating.

Clock gating is used for reducing DYNAMIC POWER by controlling switching activities on the clock path. Generally Gate or Latch or FF based clock gating cells are used for implementing clock gating.

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