Programmable logic device

Details Programmable logic device Programmable logic device

H - Electricity

03

K

328/146

H03K 19/177 (2006.01) G06F 7/50 (2006.01)

Patent

CA 1314594

ABSTRACT OF THE DISCLOSURE A required number of coincidence detecting circuits for the combinations of N input signals are provided, so that useless PLEs as seen in a table lookup type are eliminated. Product term lines of PLA are extended by a first extension circuit. Similarly, respective coincidence detecting outputs of coincidence detecting circuits of another PLE are connected to each other, so that coincidence signals can be output in association with M (? N) input signals. Coincidence detecting signals of further PLE are connected by a second extension circuit, whereby the number of storing of combinations of N or M input signals is extended to P sets or more, so that the number of input signals N can be set at a low value. There are added programmable selectors for making some of input signals into the coincidence detecting circuits replaceable with other input signals, so that the operating efficiency of PLE can be improved.

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