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Special carry adder for nine complement carry - delivers false carry when first two digits of serial complement cycle are subtracted additively or vice=versa
Special carry adder for nine complement carry - delivers false carry when first two digits of serial complement cycle are subtracted additively or vice=versa
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机译:特殊的进位加法器,用于九个补码进位-在串行补码周期的前两位数字相减时提供错误的进位,反之亦然
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摘要
The circuit is necessary only when the dual full adders (5, 6) of a reversible tetrad adder-subtractor are not provided with further adders which render the existing adder (4) superfluous. 16 two-input AND gates (7) are used with 10 two-input and 2 three-input OR gates (8, 9) and four NOT gates (10). A special nine's complement circuit (2) is capacitively coupled (21) to a carry adder (4) based on two simple flip-flops (16, 17) similar to those of the carry storage circuit. USE - In connection with 5211 tetrad adder combined with nine's complement and straight-ahead circuits.
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