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IP Mezzanine Bus

Mezzanine boards are small form factor cards designed to plug onto larger form factor boards.
The larger main boards can be designed to support one or more Mezzanine boards.
Not all mezzanine formats are supported by the main boards.
An IP card is one particular style of mezzanine card with a defined size and defined I/O.
A single-wide card outline is shown below, but a double-wide card is also available.

Single Width IP Card Dimensions

IP Description

IP: IndustryPack; ANSI/VITA 4 1996
The IP board uses two connectors and two different board sizes. Single width boards are; 1.8" x 3.9". Double width boards are; 3.6" x 3.9".
Up to four single width cards, or two double width cards will fit onto a standard 6U VME card.
When main boards are used only to support IP cards, they are called carrier boards.
The pinouts listed below are staggered as the pins on the 50-pin connector are staggered. Another 50 pin connector is also called out in the standard, but the pin out is not defined.
The connector is optional, with the signals routed one for one to a 50-pin header on the main board. A double wide card will have 4 50-pin connectors.
The 3 additional connector pin outs are not defined in the IP specification, they are used for I/O signals.
The IP electrical interface uses standard 5 volt CMOS levels [74HCTxx] and may operate at either 8MHz or 32MHz.
How ever the Ack* pin may be driven by a CMOS or TTL device. All signals have a 10k ohm Pull-Up resistor located on the IP card.
The components on an IP card are mounted on the same side of the board as the connectors, and face the main board.

PICMG 2.4 R1.0: specifies the IP I/O Pin Assignments on CompactPCI; defines user I/O pin mappings from ANSI/VITA standard IP sites to J3/P3, J4/P4 and J5/P5 on a CompactPCI.
VITA 4.1 defines the I/O mapping on VME64x cards [VME P0 connector and/or VME P2 connector].

IP Board Manufacturers

Single Width IP Card

This is a listing of COTS IP Mezzanine Card manufacturers. The types of products or devices they produce are listed under the company name. IP Boards are normally used for non-processor based I/O support. A carrier card, which would be a VME card, may also be under that listing and not under the mezzanine listing. Acromag {Analog I/O, Digital I/O, Counter/Timers, Serial I/O IP Boards; IndustryPack Carrier Cards} Alphi Technology Corp. {Industry Pack Modules, MIL-1553, FPGA; Altera/Xilinx. ADC, TTL, bi-directional digital, 16 bit counters timers, opto isolated inputs} Dynamic Engineering {General purpose I/O & TTL I/O IndustryPack modules} N.A.T. {IP Card Manufacturer}

Other common IP functions include RS232, RS422, RS485 and GPIB interfaces.

CMC Description

Note that CMC data is listed here, but the IP card does not comply with the CMC specification.
It appears that the IP spec was already released by the time, or before, the CMC standard was released.
However the information is provided to indicate the differences, especially with the connectors which are denser with CMC.
Also that the physical size is different between the standards and that the IP spec uses inches, while the CMC uses mm.

The CMC standard also calls out boards that extend to and or use the front panel of the host board.
The IP standard mounting is completely in-board, the cards do not extend out the from panel.

CMC: Common Mezzanine Card. IEEE 1386 Standard Mechanics for a Common Mezzanine Card Family.
Defines the mechanical specification for the IEEE 1386 series of Mezzanine Cards.
The card size is 74mm x 149mm x 8.2mm (single width) or 149mm x 149mm x 8.3mm (double width).
IEEE1386 uses Board-to-Board 1.00mm(.039") Dual Row connectors.
Mezzanine cards, designed to this standard, can be used interchangeably on VME, VME64 and VME64x boards and CompactPCI boards.
Additional standards define the board pinout to backplane pin outs.

Navigation > Engineering Home > Interface Buses > Mezzanine Buses > IndustryPack Card.

There's nothing wrong with using an IP card, but it is one of the older mezzanine formats.
More importantly the IP standard uses a less dense pin spacing with the connectors.
So these cards will never be able to handle high density I/O.
Expect these style cards to only handle I/O and not high-speed processor related functions, or high-speed I/O.
Although they could contain a processor, but the number and speed of the data transfer would need to be held at the rates indicated.
In other words, don't design to the IP format, unless your using a carrier card that has IP slots already on it.
The IndustryPack mezzanine format is out-dated and should not be used in a new system, as it limits the speed and number of I/O.
Of course if a system already uses a carrier board or baseboard that requires an IP card, than this style might still be required.

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