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首页> 外文期刊>IEEE Journal of Solid-State Circuits >Reducing switching activity on datapath buses with control-signal gating
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Reducing switching activity on datapath buses with control-signal gating

机译：通过控制信号门控减少数据路径总线上的开关活动

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摘要

This paper presents a technique for saving power dissipation in large datapaths by reducing unnecessary switching activity on buses. The focus of the technique is on achieving effective power savings with minimal overhead. When a bus is not going to be used in a datapath, it is held in a quiescent state by stopping the propagation of switching activity through the module(s) driving the bus. The "observability don't-care condition" of a bus is defined to detect unnecessary switching activity on the bus. This condition is used to gate control signals going to the bus-driver modules so that switching activity on the module inputs does not propagate to the bus. A methodology for automatically synthesizing gated control signals from the register transfer level description of a design is presented. The technique has very low area, delay, power, and designer effort overhead. It was applied to one of the integer execution units of a 64-bit, two-way superscalar RISC microprocessor. Experimental results from running various application programs on the microprocessor show an average of 26.6% reduction in dynamic switching power in the execution unit, with no increase in critical path delay and negligible area overhead.
机译：本文提出了一种通过减少总线上不必要的开关活动来节省大型数据路径中功耗的技术。该技术的重点在于以最小的开销实现有效的节能。当总线不打算在数据路径中使用时，通过停止通过驱动总线的模块进行的开关活动的传播，将总线保持在静态。定义总线的“可观察性无关条件”以检测总线上不必要的开关活动。此条件用于选通进入总线驱动器模块的控制信号，以使模块输入上的开关活动不会传播到总线。提出了一种根据设计的寄存器传输级别描述自动合成门控控制信号的方法。该技术的面积，延迟，功耗和设计人员的工作量都非常小。它被应用于64位，两路超标量RISC微处理器的整数执行单元之一。在微处理器上运行各种应用程序的实验结果表明，执行单元中的动态开关功率平均降低了26.6％，而关键路径延迟没有增加，而面积开销却可以忽略不计。

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