Compact Peripheral Component Interface
PXI Bus
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The newest version of PXI is called PXI Express and is an implementation of CompactPCI Express which combines the
PCI Express, cPCI, and PXI standards into a new
backplane standard. The specification will retain the form factor
described in the cPCI standard, the EMI standards from the PXI
standard and adopt the low signal count of the PCIe standard. Software remains
compatible with the change from PCI and PCIe, so the movement from
PXI to PXIe should also be software independent. The PXIe
specification was released in 2005. |
|
The PCI bus operates either synchronously or asynchronously with the
"Mother Board" bus rate. While operating asynchronously the bus will
operate at any frequency from 66MHz down to (and including) 0Hz. Flow
control is added to allow the bus to operate with slower devices on
the bus, allowing the bus to operate at their speed. PCI is an
unterminated bus, the signals relay on signal reflections to attain
their final value. The PCI specification has been port-ed to a number
of other form factors. |
PXI-5 PXI Express Hardware Specification, 8/2005
.. PXI-5 PXI Express Hardware Specification Rev 1.0 ECN-1, 4/2006
PICMG 2.0 Rev 3.0 CompactPCI Core Specification; See also the
PCI Page
PICMG 2.1 Rev2.0 CompactPCI Hot Swap
PICMG 2.2 Rev1.0 VME64x on CompactPCI [VME64x bus on the P4/P5
connectors]
PICMG 2.3 Rev1.0 PMC on CompactPCI
PICMG 2.4 Rev1.0 IP on CompactPCI
PICMG 2.5 Rev1.0 CompactPCI Computer Telephony
PICMG 2.7 Rev1.0 6U CompactPCI Dual System Slot
Specification
PICMG 2.9 Rev1.0 CompactPCI System Management
PICMG 2.10 Rev1.0 Keying of CompactPCI Boards and Backplanes
PICMG 2.11 Rev1.0 CompactPCI Power Interface
PICMG 2.12 Rev2.0 Hot Swap Infrastructure Interface
PICMG 2.14 Rev1.0 CompactPCI Multicomputing Specification
PICMG 2.15 Rev1.0 PCI Telecom Mezzanine/Carrier Card [H.110 [TDM
bus] Computer Telephony]
PICMG 2.16 Rev1.0 CompactPCI Packet Switching Backplane
Specification [cPSB] (GigaBridge, Ethernet)
PICMG 2.17 Rev1.0 CompactPCI StarFabric Specification
PICMG 2.20 Rev1.0 CompactPCI Serial Mesh Backplane
Specification
PXI Rev 1.0 PXI; PCI eXtensions for Instrumentation
Compact PCI Industrial Computer Manufacturers Group {PICMG} .. IEEE {Institute of Electrical and Electronic Engineers}, www.ieee.org
PXI Specification PCI eXtensions for Instruments Version 1.0, 1997
PXI Specification PCI eXtensions for Instruments Revision 2.0, 2000
An Implementation of CompactPCI
Card dimensions [size] / Form Factor
J1 for either the 3U or 6U form factor is used to provide 32-bit
PCI signals.
J2 for either the 3U or 6U form factor is used to provide 64-bit
PCI signals and some PXI features.
J3 on the 6U form factor is reserved under the PXI
specification.
J4 on the 6U form factor is reserved under the PXI
specification.
J5 on the 6U form factor is reserved under the PXI specification Rev 1.0, opened in Rev 2.0.
The PXIe bus uses some of the same pinout as the PXI bus.
PXI Express Peripheral Slot Pinout
PXI Express System Slot Pinout
PXI Express Hybrid-Peripheral Slot Pinout
PXI Express System Timing Slot Pinout
The Signal Assignments change from revision 1.0 to revision 2.0 to comply with changes in PICMG 2.0 R3.0
Using the same specification as PCIe, PXIe and cPCIe may use the same IC's as the PCIe bus specification.
Integrated Circuit [IC] manufacturers are listed on the PCIe Bus page.
IC Manufacturers{All other types}
The PXI bus uses 2mm 'Hard Metric'; IEC 1076-4-101, a number of different
pin arrangements. 2mm connector manufacturers are listed on the cPCI page. Normally the outside Ground
rows (which are compression pins) 'Z' and 'F' are not counted as pins.
OEM pin numbering may be by cPCI or in accordance with IEC 61076-4-101
(which is reversed). The term "Hard Metric" only means that metric
dimensions are preferred ~ with-out regard to inches.
cPCI 2mm connectors mating distances [12.50mm] matches the 96 pin DIN
41612 connectors used with other EuroCard packaging [IEC 273 or IEEE
1101, 1101.10], like VMEbus. FutureBus connectors, which also use 2mm
style has a mating distance of 10mm, and is not compatible with cPCI
connectors.
The types below are counting signal pins (not the ground rows), as
indicated on many data sheets:
Type A Connectors; 110 pins, Keyed (J1/J4),([25 rows x 5
columns] - [3 rows x 5 columns of Key])
Type B Connectors; 110 pins (J2/J5), [22 x 5]
Type B Connectors; 95 pins (J3), [19 x 5]. This is also
used as P0 with VME64
Type C Connectors; 55 pins [11 x 5]
Type AB Connectors; 95, 110, or 125 pins
There are other types:
Type L Connectors; # contact cavities to accept power insert
contacts
Type M Connectors; # contact cavities to accept power insert
contacts/with half the connector having normal pins
PXI connector manufacturers are listed on the cPCI page. Both the cPCI bus and PXI bus use the same connectors.
National Instruments {8-Slot PXI Chassis Accepts PXI and PXI Express Peripheral Modules with Up to 3 GB/s System Bandwidth}
The PXI chassis, or CompactPCI [cPCI] Chassis will be between 1 and 8
slots (the maximum). Either PXI or cPCI chassis will have one controller
slot and up to 7 peripheral slots. The System slot must be at the left
end of the PCI segment. Printed Wiring Boards [PWB] are spaced on 0.8
inch centers.
The chassis may accept 3U cards, or 3U and 6U cards. The chassis may have
a separate card cage to handle the 3U cards.
The chassis shall provide a +5volt, +/- 12volt and a 3.3volt supply @
maximum ripple 50mV. I believe the Telcom version provides 48 volts as
the system power.
The backplane is passive. The bus requires one card acting as the systems
controller residing at either end of the back-plane (chassis), termed the
System Slot. The remaining cards (slots) are termed the Peripheral Slots.
In general cPCI and PXI cards may be interchangeable in either type
chassis.
PXI, cPCI for Instrumentation uses the same chassis as cPCI. PXI Chassis Manufacturers
In cPCI, the system slot may reside in any slot of the back plane with the other 7 slots as peripheral cards. In PXI, the left most slot is the system slot followed on the right by 7 peripheral slots. In addition, 3 other slots, with do not contain back plane connectors may reside to the left of the system slot. These additional 3 slots provide expansion (wider card) for the system card.
CompactPCIe [cPCIe] uses the Euro Format [dimensions], see figure
above..
IEEE 1101.1 Base Document for Mechanics
IEEE 1101.10 Mechanics for VME Boards and Subracks
IEEE 1101.11 Mechanics for Rear Transition Modules
CompactPCI Express [cPCIe] cards may be either 3U {100mm x 160mm} or 6U {233 x
160mm).
The boards should be keyed to indicate either 5V or 3.3v operation.
3U card will use J1 and may use J2, 6U cards shall use J1 and may use J2
to J5.
J1 is used for 32 bit PCI, J2 is used for 64 bit PCI, J3 to J5 are used
for user definable signals.
cPCI Board vendors
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