Most existing I/O buffer model development methodologies are based on actual circuit designs. Such descriptions reveal detailed information not only about the buffer design, but also about the underlying, proprietary fabrication processes. In contrast, IBIS uses voltage-versus-current characteristics, along with additional circuit, package and timing information to describe the buffers. This form of data protects the semiconductor vendor's proprietary information about the design, and process technology while still providing a highly useful and accurate model for the end users.
"By standardizing on a non-proprietary method of specifying models, the industry has a win-win situation," states Jon Powell, product manager, transmission line tools at Quad Design. "Semiconductor companies can deliver the information once, EDA tools have a ready and easy source for models, and end users gain high-performance, accurate models."