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Functional Description
4.4.1
Connectivity
The two 10Gbps XAUI ports from the front blade base switch connect to a BCM8727 dual
XAUI-to-SFI PHY which then connect to two individual SFP+ connectors using an SFI
interface as shown in
capacitors on the XAUI inputs from the front blade. Similarly, capacitors are expected to be
provided on the front blade for signals from the RTM. The SFP+ specification requires AC-
coupling capacitors in the module so they are not needed on the blade SFI interface.
Figure 4-3 Fabric 10GB Interconnect
Base Switch
Zone 3 Connector
4.4.2
Front Blade Port Mapping
The two base channel ports connect to the front blade ports BIX_XG0 and BIX_XG1. These
ports connect directly to dedicated ports on the ATCA-F140 front blade base switch.
BIX_XG0 is connected to BCM8727 channel 2 while BIX_XG1 is connected to BCM8727
channel 1.
4.4.3
BCM8727 Configuration Flash
The BCM8727 requires an external SPI flash to store microcode for the internal
microcontroller. A single SPI flash is connected to the FPGA and the SPI bus from the
BCM8727 is similarly connected to the FPGA. Register settings in the FPGA allow the
BCM8727 to connect to the SPI flash as well as provide a programming port.
4.4.4
Transmitter Control
The TXONOFF signals on the BCM8727 are individually connected to the RTM FPGA
which allows them to be driven under software control. This enables software to enable and
disable the SFP+ optical outputs.
58
4-3. The RTM-ATCA-F140 includes 0.1μF AC-coupling
Figure
2x 10GbE to Base Switch (XAUI)
RTM-ATCA-F140 Series Installation and Use (6806800M97M)
2x SFI
DUAL PHY
BCM8727
Functional Description
Front Panel
2x SFP+
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