BAT: Performance-Driven Crosstalk Mitigation Based on Bus-Grouping Asynchronous Transmission

Guihai YAN  Yinhe HAN  Xiaowei LI  Hui LIU  

IEICE TRANSACTIONS on Electronics   Vol.E91-C    No.10    pp.1690-1697
Publication Date: 2008/10/01
Online ISSN: 1745-1353
DOI: 10.1093/ietele/e91-c.10.1690
Print ISSN: 0916-8516
Type of Manuscript: PAPER
Category: Integrated Electronics
crosstalk delay,  on-chip buses,  bus-grouping transmission,  asynchronous,  shielding,  

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Crosstalk delay within an on-chip bus can induce severe transmission performance penalties. The Bus-grouping Asynchronous Transmission (BAT) scheme is proposed to mitigate the performance degradation. Furthermore, considering the distinct spatial locality of transition distribution on some types of buses, we use the locality to optimize the BAT. In terms of the implementation, we propose the Differential Counter Cluster (DCC) synchronous mechanism to synchronize the data transmission, and the Delay Active Shielding (DAS) to protect some critical signals from crosstalk and optimize the routing area overhead. The BAT is scalable with the variation of bus width with little extra implementation complexity. The effectiveness of the BAT is evaluated by focusing on the on-chip buses of a superscalar microprocessor simulator using the SPEC CPU2000 benchmarks. When applied to a 64-bit on-chip instruction bus, the BAT scheme, compared with the conservative approach, Codec and Variable Cycle Transmission (DYN) approaches, improves performance by 55+%, 10+%, 30+%, respectively, at the expense of 13% routing area overhead.