CompactPCI Serial

CompactPCI Serial is an industry standard for modular computer systems. It is based on the PICMG 2.0 CompactPCI standard that uses the parallel PCI bus for communication between the individual components in a system. In contrast, uses only CompactPCI Serial serial point-to -point connections. CompactPCI Serial was officially adopted in March 2011 by the PCI Industrial Computer Manufacturers Group PICMG PICMG CPCI as S.0 CompactPCI Serial. The mechanical design is based on the IEEE and IEEE 1101-1-1998 1101-10-1996 (19 " ) technique. CompactPCI Serial describes various connectors that allow a high data throughput. The technology standard that replaces the parallel CompactPCI, contains a further specification PICMG 2.30 CompactPCI called PlusIO. That's why they called CompactPCI Serial and CompactPCI PlusIO as a whole initially CompactPCI Plus. The first working title for the PICMG CompactPCI Serial was CPLUS.0.

History

At the beginning of the 21st century, high-speed serial point-to- point connections with the state of the art and gradually replace the traditional bus architecture into computers .. The CompactPCI standard provides no standardized solution for the kind of modular networking. Therefore CompactPCI Serial is created by default. He introduces a serial topology and at the same time retains the basic concepts of CompactPCI with.

Star architecture

Thanks to the chipset architecture, the structure of computers changes away from bus- based connections between interface controllers towards a star architecture, which is based on serial two-point connections. CompactPCI Serial implements this architecture. A system slot can control up to eight peripheral slots. Two of these connections may be implemented as PCI-Express Fat pipes ( x8 ). At the same time needs CompactPCI Serial neither Bridges nor switched fabrics or special backplanes. The star connection contains the standard PCI Express, SATA / SAS and USB.

Ethernet as a meshed network

By fully meshed Ethernet according to IEEE 802.3 Ethernet standard CompactPCI Serial is nine modules in a system connect (a system - and eight peripheral slots ). Thus, the specification is optimized for symmetric multiprocessing and redundant systems.

Interfaces

The system slot with PICMG CPCI S.0 supports the following interfaces on the rear panel connector:

  • 8 × PCI Express 6 x4 Links
  • 2 x8 links ( Fat - Pipes )
  • 2 High-speed I ² C bus especially for fat pipes
  • Optional Serial RapidIO
  • Supported by SGPIO bus (specification SFF- 8485 ) for hot swapping.

The peripheral slot with PICMG CPCI S.0 supports the following interfaces on the rear panel connector:

  • Supported by a special SGPIO bus (specification SFF- 8485 )

Power of CompactPCI Serial

PICMG CPCI S.0 defined for both system and peripheral slots a simple 12 - V power supply.

Backplane connector of the CompactPCI Serial

The working range of PICMG, which processes the standard has proposed a backplane connector type of higher density. His pitch is 2 mm × 1.4 mm and it supports higher transfer rates up to 12 Gbit / s, without the need for bridges or switches. It includes up to 184 pin pairs on a 3U card. A big difference compared with CompactPCI is that when CompactPCI Serial pin strip is placed on the module while the connector is on the backplane. This approach should make the standard robust by bent pins are avoided on the backplane. If a connector pin fails, only the plug must be replaced. The system slot CompactPCI Serial has six connectors: P1 to P6. In peripheral cards only P1 is authentic set, while P2 can be fitted to P6 optional.

Rear-E/A-Konzept

A CompactPCI Serial peripheral slot only has a small connector with 6 rows of contacts for power supply and signals. The rest of a 3U Eurocard is free for custom I / O and provides differential contact pairs 128 and 384 contacts. 6U double Eurocard cards represent all the upper range of the module for custom I / O available, as already PICMG 2.0 CompactPCI boards of this size. One advantage of the new architecture is that front and Rear-E/A-Karten be plugged into each other directly. Unlike CompactPCI here is neither a " midplane " nor a transfer plug needed.

Compatibility and Migration

The mechanics of specification PICMG CPCI CompactPCI Serial S.0 corresponds to 100 % PICMG 2.0 CompactPCI, with the exception of the new backplane connector. Because the two standards having different topologies, there is no direct " bus compatibility ." Therefore, the PICMG has also worked out an extension to CompactPCI: PICMG 2.30 CompactPCI PlusIO. This standard is intended as a migration path from CompactPCI to CompactPCI Serial. It is 100 % compatible with CompactPCI, but has a fixed definition of fast, serial I / O ports on the back panel connector J2. The connector type of the J2 is also new. It is compatible, but supports a higher data throughput than CompactPCI. Hybrid backplanes support multiple modules of three different standards PICMG 2.0, 2:30 and CPCI S.0.

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