Low-power on-chip communication based on transition-aware global signaling (TAGS)
Low-power on-chip communication based on transition-aware global signaling (TAGS)
复制标题
基于转换感知全局信令 (TAGS) 的低功耗片上通信
DOI：
10.1109/tvlsi.2004.826199
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发表时间：
2004
影响因子：
2.8
通讯作者：
D. Sylvester
中科院分区：
文献类型：
--
作者：
Himanshu Kaul;D. Sylvester
在本文中，我们提出了一种新的电路结构，即转换感知全局信令（TAGS）接收器，它可以检测任意开关点的转换。该电路的主要性能优势发生在它在输入跃迁的50%点之前切换时。静默时，TAGS接收器存储线路的下一个状态。在检测到行尾的转换后，输出暂时由存储的下一个状态驱动。接收器输出端的转换比线路末端的转换快得多，因为它们是在本地生成的。它能够在标准逆变器之前检测转换，并在其输出处本地生成转换，允许其在与标准中继器范式相同延迟的中继器较少的长互连结束时使用。使用TAGS方案需要更少的中继器，从而降低了片上全局通信的功耗，同时还减少了大型缓冲块所涉及的放置开销。这在总线优化的上下文中显示，与标准中继器相比，TAGS实现了高达50%的功耗降低。在工业0.13-/spl mu/m CMOS工艺中，tag接收器使8mm长的总线在1.5 ghz时钟速率下无需中继器，而传统方案需要在线上三个中继器。对公共汽车环境中串扰噪声的广泛分析表明，标签可以处理典型公共汽车结构中产生的噪声水平。此外，在最坏情况下，tag方案的总线结构延迟变化通常小于使用标准中继器方案的延迟变化。
In this paper, we propose a new circuit structure, the transition aware global signaling (TAGS) receiver, that detects transitions at arbitrary switch points. The major performance advantage of this circuit occurs when it switches before the 50% point in the input transition. The TAGS receiver stores the next state of the line while quiet. Upon detection of a transition at the end of the line the output is temporarily driven by the stored next state. Transitions at the output of the receiver are much faster than at the end of the line since they are generated locally. Its ability to detect transitions before a standard inverter and locally generate them at its output, allows its use at the end of long interconnects with fewer repeaters for the same delay as the standard repeater paradigm. The need for fewer repeaters with the TAGS scheme results in lower power consumption for on-chip global communication, while also reducing the placement overhead involved with large buffer blocks. This is shown in the context of bus optimizations, where TAGS achieves up to 50% reduction in power compared to standard repeaters. In an industrial 0.13-/spl mu/m CMOS process, TAGS receivers enable 8-mm-long buses at 1.5-GHz clock rates without repeaters, while the traditional scheme required three repeaters on the line. An extensive analysis of crosstalk noise in the bus environment shows that TAGS can handle the noise levels produced in typical bus structures. Also, the variation of delay in the bus structure under worst-case power supply noise for the TAGS scheme is typically smaller than the delay variation using the standard repeater scheme.