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IEEE-ISTO Std 4900-2021:  Digital IF Interoperability Standard, v1.2.0
August 2023

Version 1.2.0 of the DIFI Standard delivers a significant improvement in the areas of sync and flow control over the previous version published in August 2022.

Version 1.2.0 adds a standard flow control mechanism, which frees up systems designers from proprietary data flow for buffer management and improves timing synchronization. These changes were enabled by a new Information Class (0x0002) and new Packet Classes 0x0002, 0x0003, 0x0005 and 0x0006. In addition, the documentation for version 1.2.0 has been restructured for clarity and expanded with a table of deviations from VITA49.2, on which the original DIFI standard was based.

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