Electrical transmission or interconnection systems – Nonlinear reactor systems – Parametrons
Patent
1992-07-23
1994-03-01
Hudspeth, David R.
Electrical transmission or interconnection systems
Nonlinear reactor systems
Parametrons
3074651, H03K 19177
Patent
active
052910792
ABSTRACT:
The present invention is used in an FPGA device having programmable logic cells and a programmable interconnect array. In a preferred embodiment in which the logic cells are programmed using transistors controlled by memory cells and the interconnect structure is programmed using antifuses, a configuration control unit (CCU) of the present invention can accomplish three functions: 1) applying programming voltages to terminals of the interconnect antifuses; 2) configuring the logic cells; and 3) reading status of signals on the interconnect structure. The CCUs are connected together into a shift register. Each CCU connects to a horizontal or vertical interconnect line. At intersections of these interconnect lines are antifuses. By loading logical 1's into the two CCUs, it is possible to address the antifuse at the intersection of the two interconnect lines. A voltage difference can then be directed to the two terminals of that antifuse for programming the antifuse. After antifuses are programmed, configuration information is shifted into the CCUs to configure the logic cells. These same CCUs can be used to capture the logical states of each of the interconnect lines, each CCU capturing one signal present on an interconnect line to which that CCU connects. The captured data can then be shifted out through the shift register.
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Birkner, J.; Chang, A.; Chua, H. T.; Chao, A.; Gordon, K.; Kleinman, B.; Kolze, P. and Wong, R.; "A Very High-Speed Field Programmable Gate Array Using Metal-to-Metal Antifuse Programmable Elements", QuickLogic Corporation, IEEE 1991 Custom Integrated Circuits Conf., May 12, 1991.
Hudspeth David R.
Xilinx , Inc.
Young Edel M.
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