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• W4226329240 abstract "In a single-flux-quantum (SFQ) circuit, almost all cells need to receive the clock signal that incurs a high clock routing overhead. Besides, the clock tree of an SFQ circuit requires the insertion of a clock splitter cell at every tree branching point that renders the conventional design flow of placement followed by clock tree synthesis (CTS) ineffective to obtain a high quality clock tree with low clock skew. Moreover, very few works in the literature attempted to minimize the maximum path length during SFQ circuit placement. The maximum path length, which is the length of the longest source-to-sink path of any data signal, should be minimized to achieve a higher final performance and to reduce the overhead for length matching in subsequent routing. To address these issues, we propose a two-stage global placement methodology and a placement refinement algorithm after placement legalization. Our two-stage global placement methodology first applies a conventional global placement algorithm to place the cells in the given SFQ circuit evenly, which is followed by CTS and clock splitter insertion, and then, performs a second stage of global placement to replace both the original cells and clock splitters at the same time. In the second global placement stage, the look-ahead legalization technique is used to spread out the original cells and the clock splitters, and the clock tree is resynthesized several times to obtain an optimized clock tree topology such that there are little overlaps of the clock splitters with the original circuit cells. We propose a novel net model in global placement that facilitates the concurrent optimization of the total wirelength and the maximum path length. After legalizing the placement of all cells, a specialized placement refinement method is run to further reduce the clock skew and the maximum path length. Compared with the previous state-of-the-art work, on average, we reduced the total half-perimeter wirelength by 9%, reduced the maximum path length by 58%, and reduced the clock skew by 32%." @default.
• W4226329240 created "2022-05-05" @default.
• W4226329240 creator A5066500192 @default.
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• W4226329240 date "2022-01-01" @default.
• W4226329240 modified "2023-09-26" @default.
• W4226329240 title "A Novel Clock Tree Aware Placement Methodology for Single Flux Quantum Logic Circuits with Maximum Path Length Consideration" @default.
• W4226329240 doi "https://doi.org/10.1109/tasc.2022.3162637" @default.
• W4226329240 hasPublicationYear "2022" @default.
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