XMC (Switched Mezzanine Card, VITA 42)

   Existing I/O cards can be easily converted to a true XMC form factor.                                               

Data Acquisition

   General Standards Corporation is a leading supplier in data acquisition I/O boards, provides a complete family of data acquisition cards for sonar, industrial, and embedded applications on several form factors/busses, and for many operating systems.    Functions available include analog I/O, serial I/O, and high speed parallel I/O.

Form Factors:


  • PCI-Express
  • PXI
  • PMC
  • PCI
  • cPCI
  • PCI-X
  • cPCI-X
  • XMC
  • VME
  • PC/104-Plus
  • PC/104-Express
  • VPX
  • Ask About Other Form Factors

  • Software Drivers:

  • Windows
  • VxWorks
  • QNX
  • Linux
  • MathWorks
  • Solaris
  • Labview
  • xPC Target
  • Ask About Other Drivers

  • Analog I/O Boards:

    • Up to 64 Input Channels per Board
    • Programmable Sampling Rates to 50M SPS
    • GPS Synchronization
    • Auto-Calibration
    • Multi-Board Synchronization
    • Sigma-Delta and Delta-Sigma Analog I/O
    • Resolutions from 12 bits to 24 bits
    Analog I/O Selection Tables

    Serial I/O Boards:

    • Serial Mode Protocols include Asynchronous, Bisync, SDLC, HDLC, IEEE 802.3, Synchronous Telemetry, Simple Clock/Data ("-SYNC" product line), and Di-phase.
    • Transceiver support RS485, RS422, RS232, RS423, V.35, RS530, as well as other software selectable mixed protocol modes
    • Up to Eight Independent Serial Channels per Board
    • Synchronous Serial Data Rates up to 10 Mbits/sec
    • Asynchronous Serial Data Rates up to 1 Mbits/sec
    • Deep Transmit and Receive FIFOs up to 128K
    • PMC and cPCI rear I/O support
    • Custom Protocols Available
    Serial I/O Selection Tables

    Digital I/O Boards:

    • Cable Transfer speeds up to 400 mb/per second
    • Large FPGA provides for flexable cable interface
    • Several cable transceiver options including RS-422, RS-485, LVDS, PECL, and TTL
    Digital I/O Selection Table

    XMC Board Standard

       XMC [VITA 42], Switched Mezzanine Card , is compatible with Compact PCI or the VME board standards, and ATCA carrier cards. The XMC board standard is based on the PMC mechanical definition, and occupies the same board area. Among the differences between XMC and PMC standards are the addition of a new set of connectors and a fabric interconnect.

    The XMC board dimensions is 74mm x 149mm for single width cards, or 149mm x 149mm for double width Modules. The XMC standard adds to the PMC specification by adding switched fabric interconnects to the existing PCI bus interface. An XMC module adds one, or optionally two, new connectors to the connectors already on a PMC. The new connectors support high-speed differential signals for fabric communications.

       PCIe is a technology which is a receiving further development and improvement. The initial standard version in general use is PCIe 1.1; however, PCI-SIG announced the availability of the PCI Express Base 2.0 specification on 15 January 2007. PCIe 2.0 doubles the data rate of each lane from 250 MP/s to 500 MP/s. PCIe 2.0 is still compatible with PCIe 1.1 as a physical interface slot and from within software, so older cards will still be able to work in machines fitted with this new version. Further information on PCIe 2.0 is detailed below.

       PCIe is backwards-compatible with PCI, and operating systems can boot on the use a PCIe-based system without modification.


       A single PCI Express serial link is a dual-simplex connection using two pairs of wires, one pair for transmit and one pair for receive, and can only transmit one bit per cycle. Although this sounds limiting, it can transmit at the extremely high speed of 2.5 Gbps, which equates to a burst mode of 320 MBps on a single connection. These two pairs of wires is called a lane.

       You can install PCI Express adapters in larger slots but not smaller ones. For example, you can install a PCI Express x1 adapter into an x16 slot (but will still operate at the x1 speed), but you cannot insert an x16 adapter into anx1 slot. This compatibility is shown in Table 5.3* below.

       PCI Express currently runs at 2.5 Gbps, or 200 MBps per lane in each direction, providing a total bandwidth of 80 Gbps in a 32-lane configuration, and up to 160 Gbps in a full duplex x32 configuration.
    Future frequency increases will scale up total bandwidth to the limits of copper (which is 12.5 Gbps per wire) and significantly beyond that via other media without impacting any layers above the physical layer in the protocol stack. The table below shows the throughput of PCI Express at different lane widths.

    *Table 5.3:

    XMC Standards

    VITA 42.0 XMC [These are all Draft Standard for Trial Use]
    VITA 42.1 XMC Parallel RapidIO Protocol Layer Standard [XMC Switched Mezzanine Card: Parallel RapidIO]
    VITA 42.2 XMC Serial RapidIO Protocol Layer Standard [XMC Serial RapidIO Protocol Layer Standard]
    VITA 42.3 XMC PCI Express Protocol Layer Standard
    VITA 42.4 XMC HyperTransport Protocol Layer Standard [Not being worked]
    VITA 42.5 XMC Aurora Pin Assignments [Not being worked]
    VITA 42.10 XMC General Purpose I/O Standard [Not being worked]

       Any PMC I/O board can be used on PCI Express, PCI-X, cPCI-X, PCI, cPCI, PC-104-Plus via an adapter. Our I/O boards are being converted to PCI Express boards as opportunities arise, view our extensive line of I/O boards.

       We have software drivers available for numerous operating systems including VxWorks, Linux, and Windows.
    Click Here for more information on software driver availability.

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