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    • 3. 发明授权
    • High speed binary and binary coded decimal adder
    • 高速二进制和二进制编码十进制加法器
    • US4138731A
    • 1979-02-06
    • US859184
    • 1977-12-09
    • Shigemi KamimotoToshio HayashiKazuyuki Shimizu
    • Shigemi KamimotoToshio HayashiKazuyuki Shimizu
    • G06F7/493G06F7/494G06F7/50G06F7/508
    • G06F7/494G06F7/508G06F2207/4924
    • A high speed binary and binary coded decimal adder which employs a plurality of partial adders and a carry look ahead circuit and is adapted to effect a binary coded decimal addition with only one processing of the adder. The partial adders are each composed of a half adder for generating a bit generate signal and a bit propagate signal, a binary mode carry look ahead input signal generator circuit part, a binary coded decimal mode carry look ahead input signal generator circuit part, an intermediate adder part and a full adder part. The high speed binary and binary coded decimal adder is capable of providing the result of an addition at a speed corresponding to six to seven logical stages.
    • 一种高速二进制和二进制编码十进制加法器,其采用多个部分加法器和进位查看提前电路,并且适于仅通过加法器的一个处理来实现二进制编码的十进制加法。 部分加法器由半加法器构成,用于产生位产生信号和位传播信号,二进制模式携带前瞻输入信号发生器电路部分,二进制编码十进制进位前瞻输入信号发生器电路部分,中间 加法器部分和全加器部分。 高速二进制和二进制编码十进制加法器能够以对应于六到七个逻辑级的速度提供加法结果。