By Umer Farooq
This e-book provides a brand new FPGA structure referred to as tree-based FPGA structure, because of its hierarchical nature. this sort of structure has been fairly unexplored regardless of their higher functionality and predictable routing habit, compared to mesh-based FPGA architectures. during this ebook, we discover and optimize the tree-based structure and we evaluation it by way of evaluating it to similar mesh-based FPGA architectures.
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Additional info for Tree-based Heterogeneous FPGA Architectures: Application Specific Exploration and Optimization
1) where Crit (B) is a measure of how close LB B is to being on the critical path, N ets(B) is the set of nets connected to LB B, N ets(C) is the set of nets connected to the LBs already selected for cluster C, α is a user-defined constant which determines the relative importance of the attraction components, and G is a normalizing factor. The first component of T-VPack’s second attraction function chooses critical-path LBs, and the second chooses LBs that share many connections with the LBs already packed into the cluster.
Since moving a vertex can change gains of adjacent vertices, after a move is executed all affected gains are updated. Selection and execution of a best-gain move, followed by gain update, are repeated until every vertex is locked. Then, the best solution seen during the pass is adopted as the starting solution of the next pass. 5 Software Flow 31 Fig. 21 The gain bucket structure as illustrated in  pass fails to improve solution quality. 2. The FM algorithm has 3 main components (1) computation of initial gain values at the beginning of a pass; (2) the retrieval of the best-gain (feasible) move; and (3) the update of all affected gain values after a move is made.
It is clear that, despite each architecture offering its own benefits, a number of architectural questions remain unresolved for asynchronous FPGAs. Many architectures rely on logic blocks similar to those used for synchronous designs [57, 69] and, therefore, the same architectural issues such as LUT size, cluster size, and routing topology must be investigated. In addition to those questions, asynchronous FPGAs also add the challenge of determining the appropriate synchronization methodology. 7 Summary and Conclusion In this chapter initially a brief introduction of traditional logic and routing architectures of FPGAs is presented.