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    • 7. 发明授权
    • Programming process for 3-level programming logic devices
    • 3级可编程逻辑器件的编程过程
    • US5349691A
    • 1994-09-20
    • US058679
    • 1993-05-04
    • David A. HarrisonAbdul Malik
    • David A. HarrisonAbdul Malik
    • G06F17/50H03K19/177G06F9/302
    • G06F17/5054H03K19/17704
    • A process of programming a programmable logic device (PLD) to carry out a specified logic function. The PLD contains three levels of logic implemented as a plurality of functional blocks, each with AND and OR planes, and a programmable interconnect matrix or logic expander carrying out AND logic. After providing such a PLD with specified size constraints and after specifying a logic function, the function is split or factored into subfunctions or factors. A Boolean factorization procedure chooses factors by replacing pairs of product terms in the first factor with their supercube and minimizing the number input terms and product terms required. Subfunctions or factors which are too large can be simplified by combining pairs of inputs in the interconnect matrix. The product terms of a subfunction or factor can be ordered according to the number of input terms they have and assigned to the functional blocks one at a time. Functional blocks which use many inputs or product terms per output can have some of their assigned subfunctions split so as to pack the PLD more densely. Split subfunctions or factors are recombined in the interconnect matrix. After assigning terms to functional blocks and the matrix, they are loaded into the PLD using a device programmer to configure the logic arrays in the PLD.
    • 编程可编程逻辑器件(PLD)以执行指定逻辑功能的过程。 PLD包含实现为多个功能块的三个级别的逻辑,每个具有AND和OR平面,以及执行AND逻辑的可编程互连矩阵或逻辑扩展器。 在提供具有规定大小约束的PLD之后,并且在指定逻辑功能之后,该功能被分割或分解为子功能或因子。 布尔因式分解程序通过用第一个因子替换成对的超立方体来选择因素,并最小化所需数量的输入项和产品术语。 子功能或太大的因素可以通过组合互连矩阵中的输入对来简化。 子功能或因子的产品术语可以根据他们已经输入的功能块的数量和功能块一次一个地排序。 每个输出使用多个输入或产品项的功能块可以将其一些分配的子功能分开,以便更密集地封装PLD。 分裂子功能或因素在互连矩阵中重新组合。 在将术语分配给功能块和矩阵后,使用设备编程器将其加载到PLD中,以配置PLD中的逻辑阵列。