The Standard Delay Format (SDF) is an existing OVI standard for the representation and interpretation of timing data for use at any stage of the electronic design process. The ASCII data in the SDF file is represented in a tool and language independent way and includes path delays, timing constraint values, interconnect delays and high level technology parameters. This standard describes the IEEE version of the SDF standard. This standard should serve as a complete specification of the Standard Delay Format (SDF). It contains: — Detailed information on how SDF is used in the design process. — Detailed semantic descriptions of all SDF constructs. — The formal syntax. — Examples.