Successful """tiprocessor system design for complex realtime embedded applications requires powerful and comprehensive. yet cost-effective. productive. and maintainable modeling. The """ti-disciplinary. VHDL-based modeling library developed by the Honeywell Technology Center places heavy emphasis on multiprocessing and distributed communications. These models focus on detailed hardware performance analysis along with multiple abstraction levels for software representation and evaluation. This paper will detail the processor model which provides the key element for the coanalysis of hardware and software system architectures.