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The PCI/104-Express™ specification establishes a standard to use a high speed PCI Express® bus in embedded applications. It was developed by the PC/104™ Embedded Consortium and adopted by member vote in March 2008. The PC/104™ Consortium chose PCI Express® because of its full PC market adoption, performance, scalability, and growing silicon availability worldwide. It provides a new high-performance physical interface while retaining software compatibility with existing PCI infrastructure.
Incorporating the PCI Express® bus within the industry proven PC/104™ architecture brings many advantages for embedded applications including fast data transfer, low cost due to the unique self-stacking bus of PC/104™, high reliability due to the inherent ruggedness of PC/104™, and long-term sustainability.
The PCI/104-Express™ standard specifies Samtec's Q2™ QMS/QFS Products in a three bank (156 pin) orientation for module stacking. Samtec specifically designed the QMS/QFS Products with a 15.24 mm stack height for top and bottom board stacking. Q2™ has triple the wipe of many high speed mezzanine interconnects making it appropriate for rugged applications.
To offer system designers greater control over PCB real estate, the PC/104™ Consortium has developed PCI/104-Express™ OneBank. This new standard is an extension to PCI/104-Express™ and uses specialized single-bank Q2™ connectors which mate to the traditional 3-bank connectors. Now, engineers can win back valuable board-edge real estate by only bringing the vital main-bus to cards with OneBank connectors. They are available in both 15.24 mm and 22 mm stack heights.
Some express mezzanine cards may present a challenge to unmate from their host. To aid in separation, Samtec has developed the SO (Precision Standoff) and JSOM (Micro Jack Screw Standoff). They act as a traditional standoff when collapsed. An Allen-key unscrews and expands the jack screw, dividing the PCBs in a steady, even motion until the mezzanine is safely separated from its host. The SO standoffs include #4-40 hardware available in a 15.24 mm stack height. The JSOM standoff family includes M2.5, M3, and #4-40 hardware available in a 22 mm stack height.
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PCI/104-Express Standard
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