The PCI Express Specification is organized as a base specification and a set of companion documents. At this time, the PCI Express Base Specification and the PCI Express Card Electromechanical Specification are being published. As the PCI Express definition evolves, other companion documents will be published.
The PCI Express Base Specification contains the technical details of the architecture, protocol, Link Layer, Physical Layer, and software interface. The PCI Express Base Specification is applicable to all variants of PCI Express.
The PCI Express Card Electromechanical Specification focuses on information necessary to implementing an evolutionary strategy with the current PCI desktop/server mechanicals as well as electricals. The mechanical chapters of the specification contain a definition of evolutionary PCI Express card edge connectors while the electrical chapters cover auxiliary signals, power delivery, and the adapter interconnect electrical budget.
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