Electronic digital logic circuitry – Multifunctional or programmable – Array
Patent
1995-06-02
1997-07-08
Westin, Edward P.
Electronic digital logic circuitry
Multifunctional or programmable
Array
326 50, H03F 19177
Patent
active
056465467
ABSTRACT:
A programmable logic cell has four logic gates, two of which are configurable. The two configurable logic gates are positioned near the logic cell inputs. Each configurable logic gate has two inputs, each input being connected to one of the four logic cell inputs. The remaining two logic gates receive the outputs of the configurable logic gates. Four independent logic cell input nodes are provided, each having associated therewith a programmable input multiplexer. Each input multiplexer can have inputs connected to at least two types of interconnect conductors. The cell also has two output paths, each having associated therewith an independently-controlled output multiplexer. The output of each output multiplexer is connected to an input of the other output multiplexer. Additional features include a multiplexer having inputs connected to two cell input nodes, a select input connected to a third logic cell input node, and an output connected to a cell output node; a system low-skew data (e.g., clock) input available to at least one of the input multiplexers; a flip-flop connected within the logic cell; and internal cell feedback. The preferred method of programming utilizes user-programmed SRAM memory cells.
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Bertolet Allan Robert
Clinton Kim P. N.
Fuller Christine Marie
Gould Scott Whitney
Hartman Steven Paul
Driscoll Benjamin D.
International Business Machines - Corporation
Murray, Esq. Susan M.
Westin Edward P.
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