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专利名称：Programmable logic device发明人：Hsieh, Hung-Cheng,Carter, William
S.,Erickson, Charles R.,Cheung, Edmond Y.
申请号：EP00202612.8申请日：19910508公开号：EP1046982A2公开日：20001025
专利附图：
摘要：Programmable logic devices which include multiple blocks of combinatorialfunction generators and storage elements, and which are interconnected by aprogrammable interconnect structure are used, among other things for performing
arithmetic functions which use logic for generating the carry function. When a largenumber of bits is to be processed, the carry function typically causes significant delay orrequires significant additional components to achieve a result at high speed. The presentinvention provides dedicated hardware within the logic blocks for performing the carryfunction quickly and with a minimum number of components. The invention takesadvantage of the fact that a carry signal to be added to two bits can be propagated tothe next more significant bit when the two binary bits to be added are unequal, and thatone of the bits can serve as the carry signal when the bits are equal.
申请人：Xilinx, Inc.
地址：2100 Logic Drive San Jose, California 95124-3400 US
国籍：US
代理机构：Gill, David Alan
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