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Enhanced macrocell module having expandable product term sharing capability for use in high density CPLD architectures
Enhanced macrocell module having expandable product term sharing capability for use in high density CPLD architectures
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机译:具有可扩展产品术语共享功能的增强型宏单元模块,可用于高密度CPLD体系结构
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摘要
An improved, high density CPLD includes a plurality of macrocell sections. Each macrocell section can receive a relatively large number of independent input terms and can generate as a base cluster, at least as many as 5 different product term signals (PT's) therefrom. Part or all of the macrocell's local 5 PT's may be used for generating a local sum-of-products (SoP) signal in a local, first-level ORring operation. Additionally SoP's generated in neighboring macrocell sections may be selectively and incrementally cascaded (cross-laced) for supplemental summing into the local SoP signal. SoP signals of neighboring sections may be further selected in a sums sharing array for second level summing. The combination of the first-level cascading (cross-lacing) and second-level sums sharing provides a wide range of programmably selectable granulations including that of having relatively fast generation of a sum of just a few PT's (e.g., ≦5 PT's) to having slower generation of sums of a much larger number of PT's (e.g., ≦160 PT's).
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