SMART Embedded Computing RTM-ATCA-F140 Series, Installation & Use Manual

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62 RTM-ATCA-F140 Series Installation and Use (6806800M97M)
Functional Description
Functional Description
4.5.5 BCM84754 Status
The LASI signals from each BCM84754 port are individually connected to the RTM FPGA
to allow them to be monitored by software. The LASI signals can also generate an interrupt
to the front blade. Refer to
GPS Connectors on page 67
for further details.
4.5.6 Fabric SFP+ Connection
This is the same as the base SFP+ connection. Refer to
SFP+ Connection on page 59
.
4.5.6.1 SFP+ I
2
C Bus
The SFP+ I
2
C bus signals (I2C_SDA and I2C_SCL) from each SFP+ site are individually
connected to the BCM84754 which includes a mechanism to allow access to the port
through the PHY management channel.
4.5.6.2 SFP+ Status Signals
The SFP+ status signals, MOD_ABS, TX_FAULT and LOS, are individually connected to
the BCM84754 which monitors them. The signals are also connected to the RTM FPGA to
allow fast detection of a loss of signal condition. Refer to
GPS Connectors on page 67
for
further details.
4.5.6.3 SFP+ Control Signals
The SFP+ TX_DISABLE signal is individually connected to the BCM84754 which drives it
under software control.
The RS0 and RS1 rate select signals from each SFP+ that are tied together and connected
to the RTM FPGA that allows them to be controlled by software. Refer to
GPS Connectors
on page 67
for further detail.