Boundary scan (IEEE Standard 1149.1-1990 technology is beginning to be embraced in chip and board designs. One key need is a way to simply and effectively describe the feature set of a boundary scan compliant device in a manner both user friendly and suitable for software to utilize. A language subset of VHDL is proposed here for this purpose. As with any new standard, the industry is learning how to apply its rules and mistakes will occur. A derivative effect of the language proposed here is that if a device is not describable by the language, then that device does not comply with the 1149.1 standard. While the converse is not true, the language still allows a syntactic check for compliance as well as a number of semantic checks. ing Group (September lOth) we gave BSDL Version 0.0 to the IEEE for their consideration as a formalized way of describing Boundary Scan devices. At a regular 1149.1 meeting held September 13th, the Working Group considered this and created a "Data Transfer Mechanism" subcommittee to investigate the needs and specifications of a description language. The BSDL Version 0.0 proposal will be used as a starting point for this effort. Both of us are members of this subcommittee with Parker as chairman. Other meeting attendees from IC vendors, ATE companies, and CAE firms firms volunteered to serve. We are in the starting phase of this process and are charged with creating a specification in time for the April 1991 European Test Conference (ETC) to be held in Munich. From many communications we have received, we know there is much interest in BSDL as a standard form for communicating boundary scan data. Indeed we know of several projects underway now that are incorporating Version 0.0, and of course, we at Hewlett-Packard are using it as well. Since a written paper appearing in the conference digest is not a complete description of a language, we have worried that individual applications would differ in the details of what BSDL really is. Therefore, we have decided to make our BSDL parser public by changing appendix C to the computerized description we have used here for BSDL. It is also available in electronic form, free of charge, via Electronic Mail at the (Internet) address: hsdl%hpmtix@hplahs.HEeom While the IEEE builds a consensus on a Data Transfer Mechanism (DTM), real problems are being solved today. This offers the possibility for a divergence in what people are creating today and what the IEEE could eventually settle on. It is our task in the DTM subcommittee to build upon the BSDL Version 0.0 initiative, making changes that are clearly indicated improvements. Therefore, two statements are possible; 9 The IEEE 1149.1 Working Group has not endorsed BSDL Version 0.0 and therefore no person may represent it as an IEEE standard or imply that a resulting IEEE standard will be identical to it. 9 The IEEE 1149.1 Working Group recogn&es that BSDL Version 0.0 is a well-conceived initiative that is likely to accellerate the creation of tools that support the 1149.1 standard. As such, changes a...
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