VPX presents many design challenges and experienced teams
like Elma Bustronic’s are best suited to take them
on. With 480 pins per slot with up to 186 differential pairs,
there is an incredible amount of I/O to route through the
backplane. Additionally, VPX uses high-speed differential
serial signals that can switch well in excess of 3.0 GHz.
The VITA 46 spec acknowledges that the backplane may require
up to 16 routing layers, and a huge 36- layer overall PCB
stackup. The result could be long via stubs which can degrade
the signal. To alleviate this, Elma Bustronic performs simulations
to optimize the signal quality of the design and minimize
the negative stub effects. One key method is to take the
performance requirements, which typically would be 3.125
GBps or 6.250 GBps and route the backplane to minimize the
layer count, but follow proper design rules. Design rules
typically specify how close signals should be to another
or to components, avoiding 90 degree bends of the signal,
and so on. Reducing the layer count can shorten the stubs,
thus reducing the stub effect. In most cases, a high-grade
laminate will need to be used even in smaller (fewer slot)
backplanes. For example, the five-slot VPX backplane uses
an FR-408 low-dielectric material to enhance performance.
OpenVPX is an initiative to incorporate system interoperability
profiles across VPX backplanes and modules. Click below
or contact Bustronic for more information on Open VPX and
VITA 65.
OpenVPX & VITA 65 Background
Information
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3U VPX Backplane
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VPX uses the high-speed multi-gig connector in a mesh topology, vastly increasing the potential bandwidth of the system. While maintaining backward compatibility with legacy VME technology via preservation of the VMEbus 3U mechanical form factor and through-mapping of the current VMEbus signals to the VITA 46 connectors.
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6U VPX Backplane
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VPX uses the high-speed multi-gig connector in a mesh topology, vastly increasing the potential bandwidth of the system. While maintaining backward compatibility with legacy VME technology via preservation of the VMEbus 6U mechanical form factor and through-mapping of the current VMEbus signals to the VITA 46 connectors.
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6U VPX Hybrid Backplane
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VPX is a high-performance architecture using switched serial fabrics, typically in a mesh topology that offers tremendous bandwidth potential. While different from the traditional VME64 P0/P1/P2 backplane architecture, VPX can be compatible with legacy systems in “hybrid” backplanes. The VMEbus signals can go across the MultiGig high-speed connectors to the legacy VME/64x slots. VME64x uses the VME parallel bus across a 160-pin DIN connector. The slot-to-slot bandwidth of the architecture is approximately 80 MBps. The DIN connectors are ideal for single-ended signals, but the VPX architecture uses the wafer-based MultiGig connector that has much greater bandwidth (slot-to-slot bandwidth is approximately 5,000 MBps) and can support either differential or single-ended signals. VME64x has only 110 undefined pins available in the J1/J2 connectors and a total of 205 pins if you include the 95 P0 pins. In comparison, VPX offers 480 pins per slot that could be assigned by the user or allocated as (up to) 186 differential pairs since the J1-J6 connectors have no required (defined) use.
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6U VPX Development Backplane
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VPX is a high-performance architecture using switched serial fabrics, typically in a mesh topology that offers tremendous bandwidth potential. While different from the traditional VME64 P0/P1/P2 backplane architecture, VPX can be compatible with legacy systems in “hybrid” backplanes. The VMEbus signals can go across the MultiGig high-speed connectors to the legacy VME/64x slots.
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VPX Test Backplane
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The Elma Bustronic 2-slot test backplane is a unique tool that lets VPX card developers and system integrators test VPX boards. The device allows the user to power up test their J1 fabric connections as they would be interconnected in the target application. Signals can be passed from one slot to the next via high speed interconnecting cables, via signals introduced through the J1 fabric connector, or accessed on the J1 fabric connector using the test backplane’s SMA and SATA cable headers.
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VPX Power and Ground Backplanes
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The VPX power and ground development backplane is a simple and cost-effective development tool. All of the pins are user defined. Power for 3.3V, 5V and 12V are included. The 7U version is standard and a 3U version is available upon request. The rear connectors are all fully loaded from RJ0-RJ6.
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Chassis
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The VPX Tower offers a carrying handle for easy portability making it ideal for prototyping, demonstrations, and for mobile applications. The unit also features advanced EMC shielding, scratch-resistant vinyl clad aluminum covers, and power components.
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VPX Accessories
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Elma Bustronic offers VPX System Accessories including a load board, extender board, SerDes test module, and RTMs.
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