VME (VERSAmodule Eurocard) P2

VMEbus P2/J2 is a 96-pin DIN 41612 Type C connector (3 rows × 32 pins, 2.54 mm pitch) used on 6U boards to extend the bus to 32-bit addressing and data.

Updated:

VME P2 - 96 pin DIN (41612, Type C) 3 rows x 32 pins VME P2 Connector - 96 pin DIN (41612, Type C) 3 rows x 32 pins [Pitch 2.54mm (.100")] @ IEEE 1014-1987

The P2/J2 connector is the second backplane connector on 6U (double-height, 160 × 233 mm Eurocard) VMEbus boards, standardised under IEEE 1014-1987 and later ANSI/VITA 1-1994 (VME64). It uses the same 96-pin DIN 41612 Type C form factor as P1/J1 — three rows (A, B, C) of 32 positions at 2.54 mm pitch — but serves a different role: row B carries the eight upper address lines (A24–A31) and sixteen upper data lines (D16–D31) needed to extend the bus to full 32-bit address and data width, while rows A and C are entirely user-defined and may carry proprietary I/O, the VSB memory extension bus, or other secondary bus signals. 3U single-height boards connect only via P1/J1 and do not use P2/J2 at all.

Pin #Signal NameSignal NameSignal Name
Row ARow BRow C
1User Defined+5vUser Defined
2User DefinedGNDUser Defined
3User DefinedRETRYUser Defined
4User DefinedA24User Defined
5User DefinedA25User Defined
6User DefinedA26User Defined
7User DefinedA27User Defined
8User DefinedA28User Defined
9User DefinedA29User Defined
10User DefinedA30User Defined
11User DefinedA31User Defined
12User DefinedGNDUser Defined
13User Defined+5vUser Defined
14User DefinedD16User Defined
15User DefinedD17User Defined
16User DefinedD18User Defined
17User DefinedD19User Defined
18User DefinedD20User Defined
19User DefinedD21User Defined
20User DefinedD22User Defined
21User DefinedD23User Defined
22User DefinedGNDUser Defined
23User DefinedD24User Defined
24User DefinedD25User Defined
25User DefinedD26User Defined
26User DefinedD27User Defined
27User DefinedD28User Defined
28User DefinedD29User Defined
29User DefinedD30User Defined
30User DefinedD31User Defined
31User DefinedGNDUser Defined
32User Defined+5VUser Defined

Notes

  • P2/J2 is used only on 6U double-height Eurocard boards (160 × 233 mm); 3U single-height boards connect through P1/J1 only.
  • The physical connector is a DIN 41612 Type C (also designated IEC 60603-2) with 96 contacts at 2.54 mm pitch, rated at 2 A per contact.
  • Row B is fully defined by the VMEbus standard for bus use; rows A and C (64 pins total) are user-defined and available for I/O expansion, the VSB memory extension bus (IEEE 1988), or proprietary secondary buses.
  • Pin B3 is shown as RETRY. This pin was RESERVED in the original IEEE 1014-1987 specification (bussed and terminated on backplanes but unassigned). RETRY was formally defined only in ANSI/VITA 1-1994 (VME64); boards implementing RETRY per VME64 remain backward compatible with IEEE 1014-1987 backplanes.
  • VMEbus uses asynchronous handshaking — there is no central timing clock driving transfers; SYSCLK (on P1) is a 16 MHz utility clock only.
  • The VMEbus signal drive types are:
    • Open collector — BBSY*, BERR*, DTACK*, IACK*, SYSFAIL*, SYSRESET*, IRQ1*–IRQ7*, BR0*–BR3*.
    • Three-state — AS*, DS0*, DS1*, RETRY*, LWORD*, WRITE*, AM0–AM5, A01–A31, D00–D31.
    • Totem-pole — BCLR*, SYSCLK, IACKIN*, IACKOUT*, BG0IN*–BG3IN*, BG0OUT*–BG3OUT*.

Signals

  • A24–A31 — Upper eight address lines (row B, pins 4–11); extend VMEbus addressing from A24 to full A32 (4.2 GB address space) when combined with A01–A23 on P1.
  • D16–D31 — Upper sixteen data lines (row B, pins 14–21 and 23–30); extend the data bus to full D32 width for 32-bit transfers on 6U boards.
  • RETRY* — Three-state output; signals that the current bus cycle should be retried by the master. Formally introduced in ANSI/VITA 1-1994 (VME64); was RESERVED in IEEE 1014-1987 (pin B3).
  • +5 V — Logic supply voltage (row B, pins 1, 13, 32).
  • GND — Ground return (row B, pins 2, 12, 22, 31).
  • User Defined — All 32 pins of row A and all 32 pins of row C are user-defined; the standard imposes no signal assignment on these positions.

References

Category:Buses Connectors