Inventors:
Richard G. Cliff - Milpitas CA, US
L. Todd Cope - San Jose CA, US
Cameron R. Mc Clintock - Mountain View CA, US
William Leong - San Francisco CA, US
James A. Watson - Santa Clara CA, US
Joseph Huang - San Jose CA, US
Bahram Ahanin - Cupertino CA, US
Assignee:
Altera Corporation - San Jose CA
International Classification:
H03K019/177
Abstract:
A programmable logic array integrated circuit has a number of programmable logic modules which are grouped together in a plurality of logic array blocks (“LABs”). The LABs are arranged on the circuit in a two dimensional array. A conductor network is provided for interconnecting any logic module with any other logic module. In addition, adjacent or nearby logic modules are connectable to one another for such special purposes as providing a carry chain between logic modules and/or for connecting two or more modules together to provide more complex logic functions without having to make use of the general interconnection network. Another network of so-called fast or universal conductors is provided for distributing widely used logic signals such as clock and clear signals throughout the circuit. Multiplexers can be used in various ways to reduce the number of programmable interconnections required between signal conductors.