Network-on-Chip Architectures: A Holistic Design Exploration by Chrysostomos Nicopoulos

By Chrysostomos Nicopoulos

The carrying on with relief of characteristic sizes into the nanoscale regime has resulted in dramatic raises in transistor densities. Integration at those degrees has highlighted the criticality of the on-chip interconnects. Network-on-Chip (NoC) architectures are considered as a potential option to burgeoning worldwide wiring delays in many-core chips, and feature lately crystallized right into a major learn area. On-chip networks instill a brand new style to conversation examine because of their inherently resource-constrained nature. regardless of the light-weight personality demanded of the NoC elements, sleek designs require ultra-low communique latencies that allows you to focus on inflating info bandwidths. The paintings provided in Network-on-Chip Architectures addresses those matters via a complete exploration of the layout area. The layout points of the NoC are considered via a penta-faceted prism encompassing 5 significant matters: (1) functionality, (2) silicon quarter intake, (3) power/energy potency, (4) reliability, and (5) variability. those 5 elements function the elemental layout drivers and significant evaluate metrics within the quest for effective NoC implementations. The study exploration employs a two-pronged method: (a) MICRO-architectural options in the significant NoC elements, and (b) MACRO-architectural offerings aiming to seamlessly merge the interconnection spine with the rest approach modules. those examine threads and the aforementioned 5 key metrics mount a holistic and in-depth assault on so much concerns surrounding the layout of NoCs in multi-core architectures.

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Similarly, the Slot Availability Tracker keeps track of all the UBS slots that are not in use. When a new flit arrives, it is stored into a slot indicated by the Slot Availability Tracker. The VC and Slot Availability Trackers are functionally identical. 10 (VC Availability Tracker). Each row of the table corresponds to one VC ID (in the VC Availability Tracker) or one buffer slot (in the Slot Availability Tracker). For each entry in the table, one bit indicates that the VC/ Slot is available (logic 1) or occupied (logic 0).

Port 1 st Inp. 8 Switch allocation (SA). (a) Generic case. (b) ViChaR case larger Stage 1 arbiters (vk:1 vs. v:1), it uses much smaller and fewer Stage 2 arbiters. The reason for the simplified second stage is that ViChaR dynamically allocates VCs as needed, instead of accepting requests for specific VCs (which would necessitate one arbiter per output VC, just like the generic case). It is this attribute that helps the ViChaR implementation incur only a slight increase in power consumption (and even achieve a small area decrease), compared to a generic architecture, as will be shown shortly.

Once a flit departs, its location in the VC Control Table is invalidated by asserting a NULL bit. There is a set of such pointers for each VC in the table. However, the overhead is minimal due to the simplicity of the pointer logic; both Departing and Arriving Flit Pointers are implemented in combinational logic and simply have to observe the non-NULL locations in their VC. 10 for VC2 (in the VC Control Table box). If all the entries in a single row of the VC Control Table are NULL, then the VC must be empty; thus, the pointer logic releases the VC by notifying the VC Availability VC Availability Tracker 1 VC (vk-1) Next Avail.

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