Functional Description
ATCA-F125 (6873M Artwork) Installation and Use (6806800J94N)
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4.7.1
Base Channel PHYs
The ATCA-F125 uses two Broadcom BCM54680 octal PHYs, a BCM54616S PHY, and a
BCM8747 PHY for the base channel. Each BCM54680 supports eight SGMII channels to
the BCM56334 and provides the physical layer functions for the 10/100/1000Base-T
connections or 10/100-T connections to the backplane. The BCM54616S PHY is a single
PHY that supports an SGMII channel to the BCM56334 and provides the physical layer
functions for a 10/100/1000 Base-T connection to the backplane.
The BCM8747 PHY is a four port XAUI to 10 Gb SFI PHY that provides the interface
between two of the Base Switch 10GbE stacking ports and the front panel SFP+ modules.
The other two ports of the BCM8747 PHY provide the interface between two of the Fabric
Switch 10GbE stacking ports and the front panel SFP+ modules. The BCM8747 requires
an external SPI flash device to load microcode into the device. An AT25256B or equivalent
SPI flash device is used for this purpose.
4.7.2
ShMC Cross-Connect
Two 100 Base-Tx ports of the base channel switch are connected to the split Base Interface
ShMC port (BC1) connector at the backplane. This connection is compliant to the "cross-
connect" ECN 3.0-2.0-001 to PICMG3.0 R3.0 as shown in the following figure.
Figure 4-6 Standard ShMC Cross-Connect
