Abstract: A programmable logic array integrated circuit has several regular columns of programmable logic circuitry and a spare column which includes a subset of the programmable logic circuitry that is included in a regular column. In the event of a defect in the circuitry in a regular column that is duplicated in the spare column, the regular column logic functions that are thus duplicated are shifted from column to column so that the spare column circuitry is put to use and the defective regular column circuitry is not used. Regular column functions that are not duplicated in the spare column are not shifted. Data for programming the columns is selectively routed to the columns with or without column shifting, depending on whether that data is for functions that are or are not duplicated in the spare column.

Abstract: In order to increase routing flexibility for the output signals of logic modules in programmable logic array integrated circuit devices, the output signal of each logic module can be swapped with the output signal of another logic module by a first level of signal swapping circuitry. The output signals of the first level of swapping circuitry can be further swapped with output signals of other first level swapping circuits by a second level of signal swapping circuitry to provide still more routing flexibility for the logic module output signals.