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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Memory data bus width: PCI bus local interface. Suggestions for changes in documents should be in the form of a proposed change of text, together with appropriate supporting comments. The solder side cover is nominally 1mm thick.

Common Mezzanine Card – CMC – PH

Whenever the PCB’s vertical position is changed, the corresponding standoff and connector’s seating surface shall also be changed. In when the effort to develop a mezzanine card standard was started, there seemed to be a market need to shrink the SBus IEEE mechanical form factor such that it would fit in a single VME board slot.

Depending on the host’s application, either or both may be used. This will vary depending on leee a 10 mm or 13 mm spacing is used. Standoffs are required to be .22 to the mezzanine card’s circuit ground.

Both the suppliers and users win by enjoying the benefits of a larger unified market. The values in the table are taken relative to the signal levels presented on the pck signals. The vertical position is variable and left open to the designer as to the exact position. This logic also needs knowledge about the capabilities of the CMC card.


Simple PMC to S-LINK Interface User’s Guide

This kit is essentially a grounding strap and a wire that connects the mezzanine card handler to the host’s chassis ground prior to installing a mezzanine oeee in to the host. TP is defined as some point on a mezzanine card’s PCB, near the connector sthat is used by the assembly equipment for the reference positioning of the connector s prior to soldering.

The mezzanine stand-off shall be an internal part that is permanently attached to the mezzanine card. This is not a manufacturing dimension with a tolerance. 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 computer platforms.

Every IEEE standard is subjected to review at least once every five years for revision or reaffirmation. The host is to provide one or more slot opening s into which the mezzanine card s are plugged.

If the host’s local bus operates on the 3. For two slot hosts, the connector numbers shall be J11 through J14 and J21 through J The Netra CP board also has a solder side cover installed. The width increment of CMCs is 75 mm.

The size and shape of desktop computers, portable computers, servers and other similar types of computers varies considerably, depending on specific target markets and associated needs. Table lists the relationship change in dimensions between the plug seating height and the standoff’s height as the side 1 and side 2 component area heights are increased or decreased. See chapter 6 of this draft standard for the required mappings. Figure illustrates how a CMC could be mounted inside a desktop or portable computer host.

Placing a small ground trace around the perimeter of the mezzanine card may also be used to bleed off any potential static energy, if the handler first touches the mezzanine card’s edge when picking it up.


The required standoffs, which are attached to the mezzanine card near the P11 and P13 connectors, shall be tied to the mezzanine card’s circuit ground so that they do not float and create unwanted antennas.

These signals are bussed across all the CMC slots and are driven by the Host module logic. They shall also at a minimum meet performance level I.

PCI Bus, PC CardBus, PCMCIA, Reader Writer, Mezzanine PMC

The center of the bezel shall be within the tolerance specified in Figure and the standoffs with the numbers given in Table A special caution should be noted as a mezzanine card with all connectors mounted could be plugged in to such a host making restricting component heights mandatory.

An add-on printed circuit board PCB which is mounted parallel to a host computer board.

More isolation may be required depending on system requirements. For maximum utilization of component space, the mezzanine card is typically placed such that the dravt component side side one of the mezzanine card faces the major component side side one of the host computer’s main board. Standoff material is not defined by this specification. Drawings are not to scale. It shall fit between both the top and bottom handles. All CMC slots shall receive these signals as input only signals.

Note that there are only single and double slot mezzanine cards.