Advanced ATM switching system hardware technology using MCM-D, stacking RAM microprocessor module

This paper describes newly developed advanced ATM switching system hardware structures based on MCM-D microprocessor modules. The Si-substrate MCM-D technology which integrates microprocessor, interface control and peripheral control custom VLSIs, high-speed SRAMs, and FPGAs is employed. An MCM-D microprocessor module is realized by combining a Motorola 68030, high-performance ASICs, and high-speed SRAM caches. This is made possible by high density packaging and high-speed 4M-byte with parity cache using 25 ns access to 4-Mbit of SRAM memory. The MCM employs 12 SRAMs, possible with the stacked RAM technique, to reduce the module size by 7/8 compared to conventional surface mounting modules. This microprocessor module technology and MCM technology will advance the development of practical B-ISDN ATM switching systems.