Electrical transmission or interconnection systems – Nonlinear reactor systems – Parametrons
Patent
1993-09-02
1994-09-20
LaRoche, Eugene R.
Electrical transmission or interconnection systems
Nonlinear reactor systems
Parametrons
307468, 307471, 307472, 364784, 36518908, H03K 1900, H03K 17693
Patent
active
053492501
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 invention takes advantage of the fact that a carry signal to be added to two bits can be propagated to the next more significant bit when the two binary bits to be added are unequal, and that one of the bits can serve as the carry signal when the bits are equal. For each bit, a carry propagate signal is generated by a lookup table programmable function generator and is used by dedicated hardware to generate the carry signal.
REFERENCES:
patent: 4124899 (1978-11-01), Birkner et al.
patent: 4706216 (1987-11-01), Carter
patent: 4758745 (1988-07-01), Elgamal et al.
patent: 4870302 (1989-09-01), Freeman
patent: 5198705 (1993-03-01), Galbraith
patent: 5258668 (1993-11-01), Cliff
patent: 5260611 (1993-11-01), Cliff
patent: 5267187 (1993-11-01), Hsieh
patent: 5280202 (1994-01-01), Chan
Xilinx Programmable Gate Array Data Book, 1989, pp. 6-30 through 6-44, available from Xilinx, Inc., 2100 Logic Drive, San Jose, Calif. 95124.
LaRoche Eugene R.
Mai Son
Xilinx , Inc.
Young Edel M.
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