Communication-aware custom topology generation for VFI network-on-chip

Abstract

The voltage-frequency island (VFI) design paradigm has strong potential for achieving high energy efficiency in emerging communication centric many-core system-on-chip (SoC) technology called network-on-chip (NoC). In VFI design, each core is allocated into a suitable domain with different voltage and frequency considering the required workload. Most VFI NoC studies have focused on regular topologies. However, today's diversified applications demand custom NoC topologies to accommodate heterogeneous many-core architectures. In this paper, we propose a low-power custom topology generation method for constructing VFI NoCs, which embraces irregular topologies. The main objective of this work is to minimize energy consumption and communication resources, hence improving communication efficiency.

Energy-efficient Custom Topology Generation for Link-failure-aware Network-on-chip in Voltage-frequency Island Regime

“…To mitigate the implementation complexity, the maximum allowable number of VFIs is set to four. We assume that the energy consumption in mcFIFO is 20% of the energy consumption of the connected router as in [20] the possible locations of faulty links. The proposed method achieves 100% coverage, same as that given by FTTG.…”

“…In [19], Ghosh et al presented a mixed integer linear program (MILP) formulation for the optimal-mapping and voltage-islanding problems, and suggested a random greedy selection. Li et al proposed energy-efficient custom topology generation for VFI NoC [20]. The common goal of these studies is achieving energy efficient NoCs.…”

“…Exploring the traffic patterns of a target application in the early stage of the algorithm is essential for the optimization of energy consumption and latency. To formalize this problem, we give the following definitions: follows [20]:…”

“…Since the clock frequency and voltage values of all cores within each VFI should be identical, the voltage/frequency values of all the cores in the same VFI are set to the maximum value among the cores (line 3-4). The communication energy is estimated by assuming the one-hop and twohop distance for inter-and intra-VFI communication, respectively [20] (line 5). This is because a pair of cores can be directly connected through a single router for intra-VFI communication, but the communication between different VFIs must pass through two routers as required by mcFIFO.…”

Intra and Inter Routing based Lifetime Improvement Method for VFI Network-on-Chip

“…In VFI NoC, the total amount of energy consumed in communication is shown in Eq. 7, which is the sum of inter-communication energy and intra-communication energy [4].…”