The RDT Router Chip: A Versatile Router for Supporting a Distributed Shared Memory

Hiroaki Nishü, Ken Ichiro Anjqt, Tomohiro Kudoh, Hideharu Amano

Research output: Contribution to journalArticlepeer-review

1 Citation (Scopus)


JUMP-1 is currently under development by seven Japanese universities to establish techniques for building an efficient distributed shared memory on a massively parallel processor. It provides a coherent cache with reduced hierarchical bit-map directory scheme to achieve cost effective and high performance management. Messages for coherent cache are transferred through a fat tree on the RDT (Recursive Diagonal Torus) interconnection network. RDT router supports versatile functions including multicast and acknowledge combining for the reduced hierarchical bit-map directory scheme. By using 0.5/jm BiCMOS SOG technology, it can transfer all packets synchronized with a unique CPU clock (50MHz). Long coaxial cables (4m at maximum) are directly driven with the ECL interface of this chip. Using the dual port RAM, packet buffers allow to push and pull a flit of the packet simultaneously.

Original languageEnglish
Pages (from-to)854-861
Number of pages8
JournalIEICE Transactions on Information and Systems
Issue number9
Publication statusPublished - 1997
Externally publishedYes


  • Cache coherent distributed shared memory
  • Interconnection network
  • Router

ASJC Scopus subject areas

  • Software
  • Hardware and Architecture
  • Computer Vision and Pattern Recognition
  • Electrical and Electronic Engineering
  • Artificial Intelligence


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