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What is VME64x?

April 26, 2017vme64x

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What is VME64x?

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In 1989, Performance Technologies developed a method of multiplexing the VMEbus address and data lines. Multiplexing scheme provides 64-bit address and data transfer capabilities on existing VMEbus backplanes while maintaining compatibility with existing VMEbus boards. In 1990, Performance Technologies’ 64-bit extensions were proposed for standardization. The standardization work was started within the IEEE and completed by VITA/VSO in 1993. In 1995, ANSI approved the VME64 Standard as ANSI/VITA 1-1994. The VME64 standard is a superset of VME. This new standard clarifies the original VME standard, adds 64-bit address and data capabilities, slot one detection, ROM/CSRs, rescinding DTACK, and a RETRY line. VME64 has the same number of bus lines on the backplane as VMEbus. VME64 boards will work in conventional VMEbus backplanes and with conventional VMEbus boards. Monolithic backplanes are recommend for VME64 systems since twice as many backplane signals can be active concurrently.