SWIFT: A 2.1Tb/s 32×32 self-arbitrating manycore interconnect fabric
Sudhir K. Satpathy, Ronald Dreslinski, Tai-Chuan Ou, Dennis Sylvester, Trevor Mudge, David T. Blaauw · 2011
A 32×32 64b self-arbitrating switch fabric called SWIFT achieves a bandwidth of 2.1Tb/s with single cycle arbitration and data transfer la-tency in 65nm technology while operating at 1026MHz at 1.2V. SWIFT co-optimizes arbiter and crossbar logic using a unique fabric architecture that integrates conflict resolution with data routing to optimally use logic and interconnect resources. It spans 0.35mm2, achieves an efficiency of 7.39Tbps/W, and operates down to 530mV. Motivation and Proposed Approach High radix, high bandwidth, and low latency switch fabrics are key enablers for high-end servers, Ethernet routers, multiprocessor NoCs, multimedia accelerators, and manycore computers in general [1,2]. Conventional switch fabrics typically consist of a crossbar to route data and a separate arbiter to configure the crossbar. This poses two hurdles for scalability: 1) Routing to and from the arbiter incurs significant overhead