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ATCA-F125 (6873M Artwork) Installation and Use (6806800J94N)
Functional Description
Functional Description
4.8
Fabric Channel Interface
The Broadcom BCM56820 switch device provides 24 10Gbps XAUI ports and four 1Gbps
SGMII ports. Fourteen of the 10Gbps ports are routed to the backplane for the switch fabric.
Two of these 14 port may be routed to the RTM under control of high speed muxes. One
XAUI port is provided to connect the switch to the secondary hub board. Six 10-Gbps uplink
interfaces from the switch are routed to the Zone 3 connectors for use by an RTM. Two
other XAUI uplink ports are routed to the BCM8747 XAUI-SFI PHY to provide two SFP+
uplinks on the front panel. One XAUI port is connected to a mux which can route the XAUI
interface to AMC ports 8-11. The four 1 Gbps SGMII ports of the BCM56820 can be routed
to different destinations across the board using a series of 2 channel 2:1 muxes. The select
pins for these mux/demux switches are controlled by the FGPA.
The P2020 service processor or the H8S IPMC can program registers in the FPGA to route
the SGMII ports to the desired destination. The P2020 service processor communicates
with the BCM56820 through the PCI Express interface to initialize and manage the switch
as well as to provide full access to the BCM56820 switch traffic.
Figure 4-7 Fabric Channel Block Diagram
