Abstract: A programmable digital modulator and methods of modulating digital data for transmission by a communication system according to operating parameters selected for various applications are provided. A two-chip system is utilized by a preferred embodiment of the invention. One chip comprises a PROM for storing impulse response data which would result from filtering the data to be transmitted. The second chip comprises a data interface for accepting input data, an address generator for generating an address of the PROM where the impulse response data is stored which corresponds to the data input to the chip and for causing the PROM to output the impulse response data stored at the address generated, and a data modulator for modulating a carrier signal with the impulse response data provided by the PROM.

Abstract: A laser programmable integrated circuit chip has a plurality of logic modules organized as rows and columns. The modules and other chip components are connected by a grid-like array of conductors. The conductors are initially unattached. Customization occurs by fusing laser diffuseable links and severing cut points on the conductors. The modules have continuous conductor lines running through them. These conductor lines aid in testing and are useful in routing and error avoidance. The chip also contains test registers to test the array of logic modules, the input/output blocks, and the conductors.