Analysis and Avoidance of Cross-Talk in On-Chip Buses

  • Authors:
  • Chunjie Duan;Anup Tirumala

  • Affiliations:
  • -;-

  • Venue:
  • HOTI '01 Proceedings of the The Ninth Symposium on High Performance Interconnects
  • Year:
  • 2001

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Abstract

Abstract: We present techniques to analyze and alleviate cross-talk in on-chip buses. With rapidly shrinking process feature sizes, wire delay is becoming a large fraction of the overall delay of a circuit. Additionally, the increasing cross-coupling capacitances between wires on the same metal layer create a situation where the delay of a wire is strongly dependent on the electrical state of its neighboring wires. The delay of a wire can vary widely depending on whether its neighbors perform a like or unlike transition. This effect is acute for long on-chip buses. In this work, we classify cross-talk interactions between the wires of an on-chip bus. We present encoding techniques which can help a designer trade off cross-talk against area overhead. Our experimental results show that the proposed techniques result in reduced delay variation due to cross-talk. As a result, the overall delay of a bus actually decreases even after the use of the encoding scheme.