Using an old version could lead to measurement errors of 20% or more when testing modern, ultra-fast diodes.
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Published by the JEDEC Solid State Technology Association , the document aims to ensure interchangeability between different manufacturers' products and eliminate misunderstandings between buyers and sellers. JEDEC - JESD79-4D - DDR4 SDRAM - Standards | GlobalSpec Using an old version could lead to measurement
While earlier versions established the baseline 1.6 GT/s to 3.2 GT/s data rates, the later revisions focus on improving reliability and clarifying ambiguities found in previous releases. Key Evolutions in the JESD79-4 Series jesd794d pdf