Electronic digital logic circuitry – Multifunctional or programmable – Having details of setting or programming of interconnections...
Patent
1995-08-09
1996-08-13
Nelms, David C.
Electronic digital logic circuitry
Multifunctional or programmable
Having details of setting or programming of interconnections...
326 39, 326 40, 326 41, 36518908, H03K 1920
Patent
active
055460186
ABSTRACT:
Programmable logic devices which include multiple blocks of combinatorial function generators and storage elements, and which are interconnected by a programmable interconnect structure are used, among other things for performing arithmetic functions which use logic for generating the carry function. When a large number of bits is to be processed, the carry function typically causes significant delay or requires significant additional components to achieve a result at high speed. The present invention provides dedicated hardware within the logic blocks for performing the carry function quickly and with a minimum number of components. The circuit includes additional structures to allow the fast carry hardware to perform additional commonly used functions. In some embodiments, the circuit also includes structures which allow efficient implementation of a loadable counter and related applications.
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New Bernard I.
Young Steven P.
Mai Son
Nelms David C.
Xilinx , Inc.
Young Edel M.
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