A high-frequency custom CMOS S/390 microprocessor

The S/390® Parallel Enterprise Server Generation 4 processor is an implementation of the IBM ESA/390™ architecture on a single custom CMOS chip. It was designed on a blank slate after consideration of remapping either a prior CMOS design or a prior bipolar design. It uses a straightforward pipeline both to achieve a fast cycle time and to speed the design cycle. The complex instructions are implemented using highly privileged subroutines called...