An MCM-D module using newly structured thermal management technique

This paper describes a newly developed MCM-D microprocessor module for advanced ATM switching systems. The Si-substrate MCM-D technology, which integrates a Motorola 68030 microprocessor, interface control, and peripheral control custom VLSIs, high-speed SRAMs and FPGAs (field programmable gate arrays), is employed. This is made possible by high density packaging with the stacked high-speed RAM technique, and reduces module size by 7/8 compared to conventional surface mounting schemes. In addition, a uniquely structured thermal management technique is employed. MCM heat flows to the printed motherboard power supply layer through via holes. Using this technique, module volume can be dramatically reduced. This microprocessor module technology and MCM technology has been developed to advance the development of practical B-ISDN ATM switching systems.