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
9	GND	BG2OUT*	GND
10	SYSCLK	BG3IN*	SYSFAIL*
11	GND	BG3OUT*	BERR*
12	DS1*	BRO*	SYSRESET*
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
21	IACKIN*	SERCLK	A17
22	IACKOUT*	SERDAT*	A16
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:
ACFail, BBSY, BERR, DTACK, IACK, SERDAT, SYSFAIL, SYSRESET, [IRQ1 - IRQ7], and [BR0 - BR3].
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:
BCLR, SYSCLK, SERCLK, IACKIN, IACKOUT, [BG0IN - BG3IN], [BG0OUT - BG3OUT].

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.


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