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    • 4. 发明授权
    • Partitioning logic operations in a generalized matrix system
    • 在一般化矩阵系统中分割逻辑运算
    • US3593317A
    • 1971-07-13
    • US3593317D
    • 1969-12-30
    • IBM
    • FLEISHER HAROLDWEINBERGER ARNOLDWINKLER VAUGHN D
    • H03K19/177G06C15/00
    • H03K19/177
    • An improved method and means to implement a logic function F of N variables by partitioning the logic operation in a plurality of generalized logic matrices. It is first mathematically demonstrated that a function F of N variables may be expanded into subfunctions of a lesser number of variables. These subfunctions may be logically implemented individually and then logically combined so as to produce the desired function of N variables with a concomitant savings in logic circuitry over that required if the functions were directly implemented. The means used to implement the logic function F are a plurality of generalized logic matrices, each of which comprises a plurality of logic gates arranged in columns and rows, an input decoder for accepting the input variables, and a storage register for varying the functions generated at the output of the matrix. These matrices are arranged in cascade so that, as the function F is constructed from the several subfunctions, additional variables are inserted at each matrix stage until the function F of N variables is fully generated.
    • 6. 发明授权
    • Improved decimal adder for directly implementing bcd addition utilizing logic circuitry
    • 改进的十进制添加剂,用于直接实施使用逻辑电路的BCD添加
    • US3629565A
    • 1971-12-21
    • US3629565D
    • 1970-02-13
    • IBM
    • SCHMOOKLER MARTIN SWEINBERGER ARNOLD
    • G06F7/494G06F7/50
    • G06F7/494G06F2207/4924
    • An improved method and logic system for adding two decimal numbers which are coded in a four-bit binary form. The method includes generating a propagate carry signal Pi for each of the four bits which is the OR function of the bit inputs, generating a generate carry signal Gi for each of the four bits which is the AND function of the bit inputs, and generating a binary carry C1 for the first bit. The decimal carry for the addition is then generated by a novel carry look-ahead technique by employing these signals: Pi, Gi, and the binary carry C1. The binary coded decimal bit signals representative of the decimal sum are also generated directly from these signals and, hence, the adder differs from prior art decimal adders which first performed binary addition in each bit and then added 6 to these binary sums whenever a decimal carry occurred so as to produce corrected binary signals representative of the coded decimal number. Several systems are disclosed employing this method and include a four-logic level, two-digit decimal adder, a three-logic level, two-digit decimal adder; and a six-logic level, eight-digit decimal adder. The six-logic level, eight-digit decimal adder combines concepts of the disclosed novel method for implementing decimal carries, as well as conventional group carry techniques used in parallel binary adders.