Introduction. (This introduction is not part of IEEE Std P, DraftStandard for a Common Mezza- The mezzanine card’s local bus can be PCI, SBus orother local buses as they are developed in the . Relationship Between VME, VME64 and VMEbus. .. Other Host PCB Mechanics. Compatibility – IEEE P PMC module which complies to PCI Local Bus Specification Revision Provides one multifunction interrupt. 5V signaling. Created for compact PCI Mezzanine Card site rack-based system designs, the read-writer’s form factor (PMC) conforms to the PMC IEEE P/Draft
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Comments on standards and requests for interpretations should be addressed to: This will allow for double sized CMCs to be plugged into those slots. Each CMC card will receive these signals and use the information to both set the logical protocol it uses on the bus and indicate back to the host module its presence if it can support that logical protocol.
Members of the committees serve voluntarily and without compensation. The component envelope is where electronic components such ICs, chips, devices, resistors, capacitors, etc. All mezzanine card standoffs those standoffs near P11 and P13 should be dravt to circuit ground at both the mezzanine card and the host board to avoid any “antenna” effects and to minimize the ground difference between the host and mezzanine card.
The associated voltage keying holes for mezzanine cards are defined in the previous chapter. The two voltage are 5V and 3. Note that special components which are not electrically isolated have conductive top pic from the PCB’s power and ground planes shall be shorter in height and shall not protrude through the special heights listed in Table See Figure and Table for point of reference.
It is optional as to which combination of connectors are used.
NVME-PMC (Bridge: VME-to-PCI) from – Embedded Computing Design
All CMC slots shall receive these signals as input only signals. The major goal of this draft standard is to provide the mechanics of a mezzanine card family that can be deployed on a variety of different host iewe platforms. Host designers should study the mezzanine card requirements in the previous chapter to understand what p138.61 mezzanine card is required to support, and then determine what is the most appropriate design for the host computer.
PCCompliant, unregistered and unbuffered. First angle projection has been used throughout this draft standard.
The preference should be to use the U deaft front panels, in all Eurocard type applications. This logic should be combinatorial in nature as there is a minimum time of 10 bus clock cycles in which to respond to a change in the BUSMODE[4: Use of information contained in this unapproved draft is at your own risk. Figure illustrates how a CMC could be mounted inside a desktop or portable computer host.
A connector or component of any kind shall not protrude outside this specified envelope.
PCI bus local interface. Occasionally questions may arise regarding the meaning of portions of standards as they relate to specific applications. Standoffs are required to be tied to the mezzanine card’s circuit ground. The second critical dimension is the horizontal center line dimension, where the center of the front panel opening shall be centered with the CMC connector group. CMC Presents to System This shoulder should be attached to the host and must present a clear hole that allows a fastener from the host side to be threaded into the mezzanine standoff.
These actual dimensions are derived from coordination dimensions using the principle of boundary and axis references illustrated in IEEE Std  and IEC . Standoffs are used to maintain the spacing between the CMC and the host, and to provide mechanical rigidity.
Any table entry that was changed will have a thicker vertical line on the right side of changed entry.
Note that two different length voltage keying pins are defined, one for 10 mm spacing and one for 13 mm spacing. When this cover rests upon components greater than 1mm in height, the cover itself may violate the CPCI specification where it rests on these components.
Multibus II front panel openings mechanics shall be per Figures and There is less mechanical flex strength in the flat front panels versus U shaped front panels. Pn is surrounded by three ground pins and is recommended for critical signals such as the clock signal. Main power on medium pins: The designation of each card size is given in the first column.
Common Mezzanine Card – CMC – PH
Other entities seeking permission to reproduce portions of this document for these or other uses must contact the IEEE Standards Department for the appropriate license. The size of these holes depends on how the standoffs are permanently attached to the CMC during assembly.
Designers shall implement specific mandatory requirements to ensure interchangeably and to claim conformance with pp1386.1 standard.
The CMC is designed to provide for this flexibility. Every IEEE standard is subjected to review at least once every five years for pdi or reaffirmation. Note that a low logic level drwft has a voltage that is lower less than than the high logic level “H”.
Specifications for the Netra CP board are provided in the following sections:. Single wide mezzanine cards are 75 mm wide by mm deep by 8. The host is to provide the keys. Whenever a shoulder is needed, the shoulder on the host module shall provide a 2. Host computer designers can then design for the worst case in both power draw as well as removal of heat generated by the mezzanine card.
Research Analyst Application For hosts that support the 10 fraft stacking height between the host and the mezzanine card, the 5. Standoff material is not defined by this specification. The angular mis-alignment of any connector shall not exceed 1. It is recommended that mezzanine card vendors list the shock and vibration standards, and to which level s that are met in the product specifications.
It is ppci that host computer vendors clearly specify to what environmental level the computer can operate and to which national and international environmental standards the computer was designed and tested.
These connectors reside on the rear of the mezzanine card. Drzft additional margin is 0. The first critical dimension is the distance between rear connectors 0.