Using Sparse Crossbars within LUT Clusters
Using Sparse Crossbars within LUT Clusters
复制标题
在 LUT 集群中使用稀疏交叉开关
DOI：
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发表时间：
2001
期刊：
影响因子：
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通讯作者：
D. Lewis
中科院分区：
文献类型：
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作者：
G. Lemieux;D. Lewis
在 FPGA 中，查找表 (LUT) 簇中的内部连接通常像完整的交叉开关一样完全连接。如此高的连通性使路由变得更加容易，但也会产生巨大的面积开销。本文探讨了使用稀疏交叉开关作为簇内簇输入和 LUT 输入之间的开关矩阵。我们已将这些矩阵内的开关密度降低了 50% 或更多，并节省了 10% 至 18% 的面积，且关键路径延迟没有降低。为了补偿可路由性的损失，需要增加计算时间和备用集群输入。进一步的调查可能会产生适度的面积和延迟减少。
In FPGAs, the internal connections in a cluster of lookup tables (LUTs) are often fully-connected like a full crossbar. Such a high degree of connectivity makes routing easier, but has significant area overhead. This paper explores the use of sparse crossbars as a switch matrix inside the clusters between the cluster inputs and the LUT inputs. We have reduced the switch densities inside these matrices by 50% or more and saved from 10 to 18% in area with no degradation to critical-path delay. To compensate for the loss of routability, increased compute time and spare cluster inputs are required. Further investigation may yield modest area and delay reductions.