PCI Mezzanine Card

As a PCI Mezzanine Card or PMC is referred to appropriate PCB 1386.1 one of the IEEE specification. Is a shape factor for daughter cards, usually I / O functions.

PCI Mezzanine Card combines 1386 specified in IEEE common mezzanine card (CMC) to the PCI bus as the electrical interface. The PCB is 149 x 74 mm in size. While it is also defined a dual PCI mezzanine card, but this is hardly ever used. On one of the faces of the board, a front plate ( bezel ) is mounted, which can receive connectors for I / O signals. The opposite side is covered by up to four 64- pin connectors (P1 to P4). Two of these connectors take the PCI bus (P1 & P2), which can be expanded with P3 from 32 -bit to 64-bit. The fourth connector P4 stands for module-specific I / O signals are available, which can be found via the backplane available. The signal voltage for the PCI bus (5 V or 3.3 V) is defined by a coding pin on the carrier board; Depending on the model some PMCs accept both voltages or just one of them.

A PMC is inserted as a daughter card to a carrier card and then lies parallel to and adjacent card ( hence the name: mezzanine = Mezzanine ). As a carrier card especially VMEbus or CompactPCI cards are common. A PMC fits on a map of Europe (eg 3U CompactPCI cards); Double Eurocards (eg in 6U VMEbus format) can accommodate up to three PMCs.

The combination of PMC carrier cards and allows building flexible and modular systems that can be expanded easily and can be retrofitted. There PMC for all possible fields of application, for example Ethernet, digital I, A / D / D/A- or graphics cards or other special applications.

Variants

The PMC specification has undergone several extensions and variants. Essentially, these are adjustments to the circuit board mechanics to special requirements or Erweitung new interfaces. Most extensions have been defined by the VITA:

  • VITA 20: CCPMC - Conduction Cooled PMC. Defines a PMC connection with special surfaces for heat sinks, which make it possible to operate the PMC in sealed enclosures without further cooling measures.
  • VITA 32: Processor PMC. Defining a Erweitung the PMC standards allow a PMC processor to operate in a system as a master CPU.
  • VITA 35: For PMC -P4 Pin Out Mapping to VME -P0 and VME64x -P2. Defines a pin mapping of PMC Back-I/Os on P4 for VMEbus cards
  • VITA 39: PCI - X for PMC and Processor PMC. Extends the PCI bus of the PMC to PCI -X.
  • VITA 42.0: XMC. The expanded PMC by an additional connector standard, via the various high-speed protocols, such as RapidIO, PCI Express, or HyperTransport can be used.

The PICMG has to do a pin- mapping of PMC Back-I/Os on P4 for Compact PCI undefined ( PMC I / O, PICMG 2.3), as well as an extension of the PMCs to different telecommunication standards ( PTMC, PICMG 2.15).

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