Recent sub-micron technology has made it possible to realize system LSIs wh
ich integrate various system functions. However, system-level integration b
rings enormous difficulties to LSI designers. It has been pointed out that
the reuse of IP macros is a very effective way to overcome these difficulti
es. This paper describes the issues that are necessitating the reuse of IP
macros and our IPHighway system, which we have constructed internally for p
romoting the reuse of IP macros. Also, recent activities in the industry fo
r distributing IP macros between companies are described.