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Appendix C: Connectors
89
4
Connector P2 pin C2 is grounded at the System Slot only. Remaining slots leave
C2 unconnected. Boards that use this signal (e.g., CPU boards that may be used
in the System Slot or Peripheral Slot) shall provide a local pullup to V(I/O). System
Slot only boards should tie this pin directly to the ground plane.
5
Connector P1 pin D21 (M66EN)is defined as GND for 33MHz backplanes. Use of
this signal in 66MHz systems will be as a bussed signal to all slots.
6
Connector P1 pin C16 (long, level 3) was originally used for early power to hot
swap capable boards for controlling the buffer logic. The PICMG Hot Swap
Subcommittee no longer considers this method viable, and other alternatives are
under consideration.
7
Connector P1 pin D15 (short, level 1) was originally used as a board select for hot
swap capable boards. The PICMG Hot Swap Subcommittee no longer considers
this method viable, and other alternatives are under consideration.
8
Observation: Some manufacturers of top shields utilize every other ground pin
while some use every ground pin.
Note: Shield connections mate at approximately the same timer as medium
length pins.
9
CompactPCI connector pin numbering is intentionally different from the connector
manufacturer’s pin numbering. This was done to allow the connectors to start at
the bottom of the board and “grow” upward from J1/P1 through J5/P5.
10
P1 and P2 connector tail lengths are defined to be “short” tail connectors with
4.5mm tails.
11
BRSV signals accommodate PCI reserved signals. Bus segments shall bus these
signals even though the PCI specification defines these pins as no connects.
12
GA[4..0] shall be used for geographic addressing on the backplane. Each
backplane connector in a CompactPCI system has a unique encoding for
GA[4..0].
13
Boards designed to CompactPCI Specification R1.0 are not required to connect
these grounds and may claim compatibility.
14
Use of JTAG signals is discouraged. Their usage will be redefined in future
revisions of the CompactPCI specification.
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