Serial Vector Format (SVF) files are used to describe high-level IEEE 1149.1 bus operations. The format was defined long ago by Texas Instruments and Teradyne, but it is still considered the de facto standard for passing serial vectors between tools used in design and test of chips and circuit boards.
Today, the specification is maintained by ASSET InterTech, Inc., a spin-off of Texas Instruments. To be certain you have the latest version of the document, go to the source. ASSET has set up a web page that will always point to the current version of the SVF document. To get the SVF specification, click on the link below.