What exactly is a SEMI “Freeze Version”?
The SEMI automation standards increase interoperability between different systems and vendors. However, all parties need to work against the same version of a standard. This is especially true at the protocol levels where software using different versions of the same standard can result in dead communications. Backwards compatibility cannot always be supported if you want to take advantage of newer technologies and features.
The SEMI Diagnostic Data Acquisition (DDA) Task Force identified this issue early on with the Equipment Data Acquisition (EDA, Interface A) standards and developed the concept of “Freeze” versions. A Freeze identifies specific versions of the SEMI standards that everyone will use to avoid confusion: everyone integrates against the same protocols, interfaces, and behaviour.
Originally defined in SEMATECH® documents, SEMI has recently published a new document that captures this information for the different EDA freezes. SEMI E178-0120 – Guide for EDA Freeze Version currently defines EDA Freeze 1 (also known as the 1105 Freeze Version) and EDA Freeze 2 (also known as the 0710 Freeze Version). When the related standards are ready, it will be updated to define EDA Freeze 3.
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