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High-performance long NoC link using delay-insensitive current-mode signaling

Ethiopia Nigussie; Sampo Tuuna; Jouni Isoaho; Teijo Lehtonen; Juha Plosila

High-performance long NoC link using delay-insensitive current-mode signaling

Ethiopia Nigussie
Sampo Tuuna
Jouni Isoaho
Teijo Lehtonen
Juha Plosila
Katso/Avaa
High-Performance Long NoC Link Using Delay-Insensitive Current-Mode Signaling.pdf (1.693Mb)
Lataukset: 

Hindawi Publishing Corporation
doi:10.1155/2007/46514
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Julkaisun pysyvä osoite on:
https://urn.fi/URN:NBN:fi-fe2021042821003
Tiivistelmä

High-performance long-range NoC link enables efficient implementation of network-on-chip topologies which inherently require high-performance long-distance point-to-point communication such as torus and fat-tree structures. In addition, the performance of other topologies, such as mesh, can be improved by using high-performance link between few selected remote nodes.We presented novel implementation of high-performance long-range NoC link based onmultilevel current-mode signaling and delayinsensitive two-phase 1-of-4 encoding. Current-mode signaling reduces the communication latency of long wires significantly
compared to voltage-mode signaling, making it possible to achieve high throughput without pipelining and/or using repeaters. The performance of the proposed multilevel current-mode interconnect is analyzed and compared with two reference voltage mode interconnects. These two reference interconnects are designed using two-phase 1-of-4 encoded voltage-mode signaling, one with pipeline stages and the other using optimal repeater insertion. The proposed multilevel current-mode interconnect achieves higher throughput and lower latency than the two reference interconnects. Its throughput at 8mm wire length is 1.222GWord/s
which is 1.58 and 1.89 times higher than the pipelined and optimal repeater insertion interconnects, respectively. Furthermore, its power consumption is less than the optimal repeater insertion voltage-mode interconnect, at 10mm wire length its power consumption is 0.75mW while the reference repeater insertion interconnect is 1.066 mW. The effect of crosstalk is analyzed using four-bit parallel data transfer with the best-case and worst-case switching patterns and a transmission line model which has both capacitive coupling and inductive coupling.

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