22 October 2003Interconnection
Integrated Solutions
Security Services & Risk Management
APW Electronics has flattened the PXI development curve by developing an extensive library of modular 3U and 6U standard PXI backplane designs to enable customers to specify their required combination of slot widths and power options.
The PXI backplanes support 33 MHz and 66 MHz clock speeds and 32 bit and 64 bit operation in both 3,3 V and 5 V signalling environments. 33 MHz systems can be up to eight slots wide, 66 MHz systems are constrained to five slots by the specification.
Systems wider than eight slots can be implemented in a monolithic backplane using addressable rear pallet bridges to connect the individual bus segments. The bridge itself spans five slot widths; it can be fitted to the rear of any suitable slots on the two segments and multiple bridges can be used in a single backplane if required.
In addition to the CompactPCI signals on P1/J1 and the 64-bit signals duplicated on P2/J2, the backplane distributes the PXI-specific signals, such as the trigger bus, the reference clock, the user-defined local buses, and the star trigger located on P2/J2. The 10 MHz reference clock achieves less than 1 ns skew required in the specification. Eight bus lines are allocated for inter-module synchronisation and communication; these lines can also be used for the distribution of variable frequency clock transmissions, allowing multiple modules to share a timebase that is not a derivative of the 10 MHz PXI clock.
The modular design approach mirrors the concept of PXI itself, enabling system integrators to benefit from a large library of standard designs from which to construct their robust configurable PXI-based instruments. In addition to the backplane itself, APW also manufacture the subracks conforming to IEEE1101.10 and IEEE1101.11 required to mount the backplane and house the plug-in modules and power converters. All individual elements of the subsystem can be easily configured to the specific requirements of the application.
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