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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.
The M-Module defines the electrical and Mechanical characteristics of the
bus. M-Modules utilize 2-row [40-pin] connectors, while MA-Modules have
3-row [60-pin] connectors for module to main board communication. The
boards come as single or double width sizes.
The M-Module [Mezzanine-Module] Card size is 52.9mm x 148.3mm, there are
other board sizes
The MA-Module [Mezzanine Addition-Module] Card handles more signals. The
M-Module uses an 8-bit, 16-bit or 32-bit data bus, and an 8-bit or 24-bit
address bus. An asynchronous SYSCLK of 16MHz is required. Power supply
voltages of +5v [1000mA], and +/-12 volts [200mA] are required. Standard
TTL logic levels are used.
ANSI/VITA 12-1996
| Pin # | Row A | Row B |
| 1 | /CS | GND |
| 2 | A01 | +5V |
| 3 | A02 | +12V |
| 4 | A03 | -12V |
| 5 | A04 | GND |
| 6 | A05 | /DREQ |
| 7 | A06 | /DACK |
| 8 | A07 | GND |
| 9 | D08 | D00 |
| 10 | D09 | D01 |
| 11 | D10 | D02 |
| 12 | D11 | D03 |
| 13 | D12 | D04 |
| 14 | D13 | D05 |
| 15 | D14 | D06 |
| 16 | D15 | D07 |
| 17 | /DS1 | /DS0 |
| 18 | /DTACK | /WRITE |
| 19 | /IACK | /IRQ |
| 20 | /RESET | SYSCLK |
Engineering Key words: Mezzanine Bus, PCI Mezzanine Card, Common Mezzanine Card, CMC Bus, Standard, Interface Standard, Specification, Spec, Electrical Interface, IC, Parallel Bus, Physical Interface, Embedded Parallel Computer Bus, Electronic connector Description, Daughter Card Component Manufacturers, Card Dimensions, Board form factor, PCB width, Mezzanine, IEEE Standards: IEEE 1386 and IEEE 1386.1, I/O schemes, Module, Carrier.
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