VME64 P1 Connector Pinout and Signal names

The P1 connector carries most of the VME bus signals, between the board and backplane.
Of course the signal assignments are the same for both the interface board and the backplane.
The P designation is used to refer to the interface board, while the J designation is used to refer to the backplane.

VME64x Bus Connector P1 PinOut and Signal names

VME64 and VME64x (optional) comes with an enhanced connector. Five rows instead of the old 3 rows used in the original VME specification. The new 160 pin DIN (5 row x 32 pin) adds rows "z" and "d". Primary additions are power (+3.3 volts) and ground (GND) on P1 and 'User Defined' signals on P2; (VME64x P2 Connector Pin Outs). Rows "A", "B", and "C" remain unchanged. The Pin out for P1 is listed above:
The pin-outs shown above are as defined by VME64x. If your using the VME 64 specification all pins in row 'd' becomes "reserved", and every other pin (non-ground; GND) in row 'z' becomes "reserved". Other wise the pin-out is the same between VME64 and VME64x. That would imply rows 'd' and 'z' are not bussed in VME64.

These new 5 row connectors will still accept the original 3 row connectors as a mate. The 2 new rows (z and d) were added as 'compression' pins on the exterior of the 3 row DIN connector.

As of 2001, I still see many 3.3 volt cards (with a 32 x 5 row connector) which rely on +5 volts (from the backplane) and use an on-board regulator to produce the +3.3 voltage. I would guess that this allows the (3.3 volt) card to be used in both a VME32 chassis or VME64 chassis. Seems like a good plan, but watch the +5v dissipation.

There are a number of different connector types used with the VMEbus.
P1 and P2 are 96 pin DIN (41612, Type C) 3 rows x 32 pins [Pitch 2.54mm (.100")] @ IEEE 1014-1987; [VME]
P1 and P2 are 160 pin DIN (41612, Type C Expanded) 5 rows x 32 pins [Pitch 2.54mm (.100")] @ ANSI/VITA 1-1994; [VME64]
P1 connectors may also come with an Auto Bus Grant [ABG] option which is an automatic [mechanical] switching capability built-in to auto jumper the slot

P2 Split DIN / RF Coax (DIN 41612 Type M) DIN + Coax @ 78 + 2, 60 + 4, 42 + 6, 24 + 8

The class of connectors determines the number of insertions it's [Mechanical Endurance] designed to handle per DIN 41612.
Class 1: 500 mating cycles [best class of connector]
Class 2: 400 mating cycles
Class 3: 50 mating cycles [not recommended for a development chassis]

A listing of companies which produce the DIN connectors used with the VME bus.
Insure the class of connected selected meets the estimated number of mating cycles.
Having the connectors fail while trying to debug a new card design is the last thing that needs to happen.

Design Hint; Don't worry about the specification changing and updating the connector functions.
The Vmebus has gone in a new direction with the VPX standard, which carry new connectors and pin out.

Topic Navigation: Engineering Home > Interface Buses > Embedded Backplane Buses > VMEbus Description > P1/J1 VME64x Signal Assignments.

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Modified 3/05/12
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