Those were the motivations of the PICMG 1.2 subcommittee that developed the Embedded PCI-X, or ePCI-X specification. This PCI-only specification was approved in January 2002 by PICMG executives. It defines a single board computer and backplane system with one or two PCI or PCI-X busses.
Two board sizes are defined. A half-size single-bus board, similar to half-size ISA SBCs, targets applications where space is a concern. The full-size single or dual-bus board is intended for more I/O intensive applications. Hence a very broad range of applications are covered, from the plain vanilla 32-bit 33MHz PCI single-bus computers, or up to 16x more I/O bandwidth with the full-fledge dual PCI-X busses at 133MHz.
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