Microarchitecture of Network-on-Chip Routers by Giorgos Dimitrakopoulos Anastasios Psarras & Ioannis Seitanidis

Author:Giorgos Dimitrakopoulos, Anastasios Psarras & Ioannis Seitanidis
Language: eng
Format: epub
Publisher: Springer New York, New York, NY

This stored grants approach turns the previously presented “elementary” SA pipeline an obsolete choice. It reduces bubbles significantly with only minimal delay overhead to the router’s control path. It also looks as if it simplifies the allocation procedure. However, in essence, it simply adds extra state registers to the arbiter’s path and a multiplexer at both control and data paths. Therefore, this approach is avoided in single cycle version, and the original request generation logic is preferred. For the same reason, the stored grants, will not be used at the next pipeline SA configuration that uses a pipeline register both in the control and in the datapath although it could have been a possible choice. The stored-grants approach for the body and tail flits is a useful pipeline alternative when SA is separated from ST solely in the control path.

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