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Digital adder and method for adding 64-bit, 16-bit and 8-bit words
Digital adder and method for adding 64-bit, 16-bit and 8-bit words
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机译:数字加法器和用于添加64位,16位和8位字的方法
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摘要
An adder for a 64-bit microprocessor which has three modes of operations, specifically, a 64-bit mode, a second mode where the adder in effect is four 16-bit adders and a third mode where the adder is, in effect, eight 8-bit adders. Two levels of Kogge-Stone trees are used, the first to generate group carries and propagate signals and the second for generating the carry signals for the 64-bit case. In the case of the 8- bit and 16-bit modes, the second level Kogge-Stone tree is not used, rather ordinary logic generates the appropriate carries. Exclusive ORing for conditional sums is performed in parallel with the generation of the carry signals.
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