PICMG 1.2, EMBEDDED PCI-X SPECIFICATION
The PICMG 1.2 Embedded PCI-X (ePCI-X) Specification for standard form factor PCI standardizes the mechanical and electrical interface to support a standard form factor PCI computer system with either two PCI/PCI-X busses or a single PCI/PCI-X bus. The document also defines the electrical and mechanical connections for a single board computer and backplane. This embedded PCI-X Specification (ePCI-X) is an evolutionary modification of the PICMG 1.0 PCI-ISA Specification; PCI-X capabilities are added to the PCI bus and the ISA bus is replaced by a second PCI-X bus. The board retains the same mechanical dimensions as PCI-ISA but the components move to the PCI side and the slot occupies a PCI position on a backplane.
PICMG's adoption of PICMG 1.2 in 2002 demonstrates that there is an evolving market for passive backplane products using standard form factor PCI and PCI-X options.