Design of a multichip module containing a 12 Way S/390 microprocessor subsystem

This paper presents the development strategy of a high performance S/390 CMOS microprocessor subsystem packaged on a 127 mm MCM. The MCM houses the complete processor core components like BU, FPU, L1-cache, L2-cache, bus-switch and DMA-controller. This multichip module set another milestone regarding miniaturization complexity and testability. The MCM-internal-net count was above 10.000 while the signals leaving the MCM passed 1700. Chipsize is up to 14.5 mm/spl times/14.5 mm.