• B.Rajasekhar
• Dr.K.Rasadurai

Networks-On-Chip (NoCs) have become the standard for communication in many-core processors where the system performance and power not only depend on the computing efficiency but are also governed by the on-chip interconnects. A key challenge for modern NoCs is to efficiently support new traffic patterns, common in advanced parallel architectures eg., Multicast (i.e., one-to-many) is is defined as sending the same packet from a single source to an arbitrary subset of destinations, widely used in the parallel computing domain: 1) in cache coherence protocols, to send write invalidates to multiple cores, e.g., in HyperTransport and Token Coherence protocols, 2) in shared operand networks, to deliver operands to multiple instructions; and 3) in multithreaded applications, to notify barrier synchronization to multiple processors. Also, multicast is used in testing of NoCs for fast delivery of test packets to multiple routers. Multicast is also gaining importance in all inherent forms of communication in emerging NoC technologies: wireless, surface-wave, photonic, and CDMA in applications like neuromorphic computing, both in spiking neural networks (SNNs) as well as in deep convolutional neural networks. A parallel multicast asynchronous NoC with a 2-D mesh topology is proposed which is the general-purpose asynchronous NoC to support multicast in 2-D meshes with a critical feature as the use of a new continuous-time replication strategy, where the flits of a multicast packet are routed through the distinct outputs of the router according to each output’s own rate, in parallel, and in continuous time. This NoC has asynchronous continuous-time replication which is not discretized to clock cycles and can handle subtle variations in network congestion and exploit “subcycle” differentials in operating speeds. For diverse multicast benchmarks, the new parallel multicast network is achieved significant latency and throughput gains over a serial baseline. Interestingly, consistent latency improvements were observed for unicast, in spite of the extra instrumentation.

Asynchronous circuits, multicast communication, networks-on-chip (NoCs).

"Improvement Throughput of Multicast GALS in Synchronous and Asynchronous NoCs", International Journal of Emerging Technologies and Innovative Research (www.jetir.org), ISSN:2349-5162, Vol.6, Issue 6, page no.802-808, June 2019, Available :http://www.jetir.org/papers/JETIR1907871.pdf

"Improvement Throughput of Multicast GALS in Synchronous and Asynchronous NoCs", International Journal of Emerging Technologies and Innovative Research (www.jetir.org | UGC and issn Approved), ISSN:2349-5162, Vol.6, Issue 6, page no. pp802-808, June 2019, Available at : http://www.jetir.org/papers/JETIR1907871.pdf