Bus encoding to prevent crosstalk delay
Bus encoding to prevent crosstalk delay
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DOI：
10.1109/iccad.2001.968598
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发表时间：
2001-11
期刊：
影响因子：
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通讯作者：
Bret Victor;K. Keutzer
中科院分区：
文献类型：
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作者：
Bret Victor;K. Keutzer
在高速设计中，跨长片上总线的传播延迟正日益成为一个限制因素。总线上相邻导线之间的串扰可能会造成很大一部分延迟。在每条信号线之间放置屏蔽线可以解决串扰问题，但会使总线使用的面积加倍，当总线使用稀缺的顶级金属资源进行布线时，这是不可接受的后果。相反，我们建议采用数据编码来消除总线内的串扰延迟。本文提出了一个严格的分析理论背后的“自屏蔽码”，并给出了基本的理论限制的代码的性能与无记忆。具体地说，我们发现，一个32位总线可以编码40线使用一个代码与内存或46线与无记忆的代码，与63线所需的简单屏蔽。
The propagation delay across long on-chip buses is increasingly becoming a limiting factor in high-speed designs. Crosstalk between adjacent wires on the bus may create a significant portion of this delay. Placing a shield wire between each signal wire alleviates the crosstalk problem but doubles the area used by the bus, an unacceptable consequence when the bus is routed using scarce top-level metal resources. Instead, we propose to employ data encoding to eliminate crosstalk delay within a bus. This paper presents a rigorous analysis of the theory behind "self-shielding codes", and gives the fundamental theoretical limits on the performance of codes with and without memory. Specifically, we find that a 32-bit bus can be encoded with 40 wires using a code with memory or 46 wires with a memoryless code, in comparison to the 63 wires required with simple shielding.