One example of an FPGA-based VME interface alternative is Curtiss-Wright’s Helix, a field-tested and proven PCI Express-to-VME64x transparent bridge that provides a full VME64xMaster/Slave interface with a direct bridge to a PCI Express upstream port
PC/104 and Small Form Factors Popular in Defense Electronics Systems
Thanks to its longevity and modularity, the PC/104 standard continues to be popular with military system designers, especially, as their size, weight, and power (SWaP) requirements continue to shrink.