VME P1 Connector Pin-Out

The table below defines the pin out for the VME P1 connector. The table which defines the pin-out for the VME P2 connector is listed on the VMEbus P2 pinout page.
Both Pin-Out tables define the 96 Pin DIN Connectors: 3 Rows x 32 Pins. Links to the 5-row [VME64] pin out are listed after the table.
The VMEbus page provides additional details including a bus interface description, Timing, connector types, card sizes, and electronic equipment and component manufacturers.

VME Bus PinOut, P1 DIN Connector
Pin # Signal name Signal name Signal name
  Row A Row B Row C
1 D00 BBSY* D08
2 D01 BCLR* D09
3 D02 ACFAIL* D10
4 D03 BG0IN* D11
5 D04 BG0OUT* D12
6 D05 BG1IN* D13
7 D06 BG1OUT* D14
8 D07 BG2IN* D15
13 DS0* BR1* LWORD*
14 WRITE* BR2* AM5
15 GND BR3* A23
16 DTACK* AM0 A22
17 GND AM1 A21
18 AS* AM2 A20
19 GND AM3 A19
20 IACK* GND A18
23 AM4 GND A15
24 A07 IRQ7* A14
25 A06 IRQ6* A13
26 A05 IRQ5* A12
27 A04 IRQ4* A11
28 A03 IRQ3* A10
29 A02 IRQ2* A09
30 A01 IRQ1* A08
31 -12v +5v Standby +12v
32 +5v +5v +5v

The VMEbus signal types are listed below:
Open collector signals which require Open Collector drivers and receivers:
Three-State signals which require 3-State drivers and receivers:
AS, DS0, DS1, DTACK, RETRY, IACK, LWORD, WRITE, [AM0 - AM5], [A01 - A31], and [D00 - D31].
Totem-Pole signals which require Totem-Pole drivers and receivers:

The pinout for the VME P1 connector is listed above. All cards most have a P1, which normally defines a 3U high card. Boards which have a P2 are 6U cards (double height). How ever 6U circuit cards are produced which do not have a P2 connector, or a card may have a P2 but may not bus the "B" row.
The P1 connector provides all the bus control signals for a 16 bit data bus and a 24 bit address bus. Using the P2 connector allows the card to use a 32 bit address bus, and a 32 bit data bus. The 32 bit data bus may be increased to 64 bits during BLock Transfers if the upper 32 bits of data are multiplexed onto the address bus.

The P2 connector also provides 2 rows of 32 pins (64 pins) on rows "A" and "C" (labeled "N/C" above) as user defined pins. These pins are not bused on the back plane and may be used by the board for any reason. Of coarse, all boards use them to increase their I/O.
Some boards adopt the "user defined" pins of rows "A" and "C" in a unique fashion, so the signals coming out will only support their card. Other cards will follow an IEEE or VITA standard to support their I/O, and still others don't require the additional I/O and don't bus the signals at all. Many cards use the pins to communicate with "Transition" cards which either reside in the rear of the chassis or the rear of the back-plane. For the cards which bus their signals as defined by a specification, their are a number of them, a short list is provided (with details, on either the "Mezzanine Bus" page or the "VME (P2) Add on Buses" page.

If the board uses a daughter card it may follow one of the Mezzanine standards to bring out its I/O. The IP standard is normally used to produce more (varied) I/O, or the PMC standard may be used (which provides more processing power).
Boards may be produced which allow one of a number of high speed "Cross-Bar" switches to increase the through-put of VME cards on the bus. RaceWay does this by adding a daughter card (on the rear of the back plane) across the P2 connectors.
A number of cards place serial buses onto the user defined P2 pins, these include: Autobahn, and SkyChannel.

VME64x and VME64 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". Primarily these additions are power (+3.3 volts) and ground (GND) on P1 and 'User Defined' on P2 (next page). Rows "A", "B", and "C" remain unchanged. The VME64 five row connector pinout is listed on either the VME64x P1 Pinout page or VME64x P2 Pinout page.

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
Class 2: 400 mating cycles
Class 3: 50 mating cycles

A listing of companies which produce or manufacturer DIN connectors used with the VME bus may be found on the main
VMEbus page along with additional details including connector types, bus pin outs, and electronic equipment and component manufacturers.

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

PC motherboard

Distributor rolodex Electronic Components Electronic Equipment EDA CDROM Software Engineering Standards, BOB card Cabled Computer Bus Electronic Engineering Design Table Conversion DB9-to-DB25.
DistributorsComponents Equipment Software Standards Buses Design Reference

Modified 12/24/11
Copyright © 1998 - 2016 All rights reserved Larry Davis