The BPX6736 is a server-class backplane with four PCI Express™ option card slots.
The butterfly form factor of the BPX6736 is designed for use in a 2U chassis.
Accepts an SHB Express™ (PICMG® 1.3) compliant (server class) processor such as an NLT/NLI, SLT/SLI or MCX-series system host board.
Using an MCX-series SHB will maximize the capabilities of all available PCI Express option card slots.
PCIe1 and PCIe3 option card slots are located on side B of the butterfly backplane. Side B is opposite the SHB and the side B slots are driven by x1 PCI express links from a MCX-series SHB. PCIe4 and PCIe2 are located on side A of the backplane and are driven with x8 PCI Express electrical links from a server-class SHB. PCIe4 is a x16 and PCIe2 is a x8 mechanical slot. SHB's support the auto-negotiation and link training features that enables all of the option card slots to support x8, x4 and x1 PCI Espress cards with PCIe4 also capable of supporting x16 PCI Express option cards with a x8 PCIe link.
Mechanical interferences may exist between the SHB's cooling solution and certain types of option card heat sinks used on PCI Express option cards installed in backplane slots PCIe2 and PCIe4. To ensure proper mechanical clearances regardless of option card heat sink type, we recommend using either half-length or quarter-length PCI Express option cards in these backplane slots. The MECHANICAL CLEARANCE CHART provides additional information.
The BPX6736 backplane is available with low-profile right-angle power connectors suitable for use with either an ATX or EPS power supply.
The +12V power connectors on the BPX6736 route auxiliary power to the SHB's edge connectors. The new capability of PICMG 1.3 compliant SHBs and backplanes eliminates the need for auxiliary power connections on the system host board.
Surface-mount LEDs provide a convenient visual check for +5V, -5V, +5V AUX, +12V, -12V and +3.3V power connection and status. CAUTION: Never install or remove the SHB or any option card from the BPX6736 backplane if the +5V AUX LED is GREEN. If the system appears to be off and the +5V AUX LED is GREEN, you need to remove or turn-off the incoming power to the system power supply.
The backplane is a six-layer, .062" thick board with three separate signal layers: +5V/+12V, +3.3V and ground. Multi-layer backplane construction provides excellent noise immunity.
The audio controller on the BPX6736 backplane eliminates the need to dedicate an option card slot to a sound card. The USB audio controller supports a variety of speaker, headset and microphone configurations. The high-performance stereo audio ADC/DAC, general purpose I/O connections and codec functionality are key features of the BPX6736's audio controller.
The USB4 port from the MCX-series SHB provides the input for the USB audio controller and the USB4 input becomes Audio0 on the BPX6736 backplane. If a NLT/NLI or SLT/SLI SHB is used, then the SHBs must be factory-equipped with the optional USB routing to the backplane. Likewise other SHBs must provide the optional USB I/O backplane routing defined in the PICMG 1.3 specification in order to enable the audio functionality of the BPX6736 backplane.
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The BPX6736 provides one USB 2.0 header capable of supporting two general purpose USB 2.0 backplane interface ports.
The BPX6736 backplane supports the optional Ethernet routing feature of the SHB Express (PICMG 1.3) specification. One 10/100/1000Base-T Ethernet RJ-45 connector is available for use on the Ethernet version of the backplane. The Ethernet port is located on Side B of the backplane. This required connector location may necessitate a mechanical modification to the chassis in order to facilitate proper backplane mounting within the enclosure. The SHB OPTIONAL BACKPLANE I/O SUPPORT TABLE explains the backplane I/O capabilities supported by The PICMG 1.3 System Host Boards.
A new approach is required to connect system power due to the combination of new power supply technologies and the soft-power control signals available via the Advanced Configuration and Power Interface (ACPI). ACPI signals are now supported by PICMG 1.3 SHBs and backplanes.
Auxiliary power connectors located on the PICMG 1.4 backplanes now deliver all of the power directly to the edge connectors of the SHB.
Auxiliary power connectors on the backplane are provided to help improve system Mean Time To Repair (MTTR). All power can be delivered to the SHB via the board's edge connectors. The PICMG 1.3 SHBs and backplane SHB edge connector slots have ample power pins available to meet the power demands of high-performance dual processor SHBs. The ATX/EPS and +12V power connectors on the BPX6736 backplane also have an ample number of power pins available to meet these demands. The system designer needs to be aware of the potential power demands of the entire system including the particular SHB to ensure that both the power supply and the power connectors in the cable harness can safely deliver the necessary power to drive the entire system.
Specific implementations of ACPI signals, ATX/EPS power supply type and the operating system software will determine the specific connection method for the power supply. For example the use of the Power Good (PWRGD), Power Supply On (PSON#), Five Volt Standby (5VSB) and the Power Button (PWRBT#) ACPI or soft power control signals require the following connection method:
ACPI signal usage is optional and may be turned off using the SHBs BIOS and/or signal jumpers. Specific power connections and BIOS parameters will differ depending on unique system design requirements. Refer to the Appendix B (Power Connection) and Advanced Setup BIOS sections found in the Technical Reference Manual for your specific system host board for more information.
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