Design aids and test results for laser-programmable logic arrays

The time required to customized a logic array circuit can be reduced to minutes by the use of laser programming without the access and resistance limitations of electrically programmable devices. A restructable logic array (RLA) that can be completely tested before packaging and can be fabricated in a standard CMOS process has been developed. Its key element is a connective laser link device. Circuits of up to 1200 gate equivalents have been restructured, and a base array of 4000 raw gate equivalents is in fabrication. A chip architecture, associated testing, and electrical design features, as well as their use in custom circuits are described.<>