
CARRIER/CMC CONFIGURATION
Copyright 2012
7-1
FibreXtreme HW Reference for FPDP Cards
7.1 Overview
The FibreXtreme carrier and SL240 rehostable CMC FPDP cards are easy to configure.
With minimal configuration, an SL240 FPDP card can transfer data between the link
interface and the FPDP interface. This appendix describes how to configure the PCI
Carrier and rehostable CMC cards.
The configuration signals are routed from the FibreXtreme FPDP card to the FPDP
Configuration Interface connector (P3) on the SL240 rehostable CMC card. If a
FibreXtreme FPDP card is not used, the custom carrier must send these configuration
signals correctly to the FPDP Configuration Interface connector (P3) on the SL240
rehostable CMC card. See Appendix G, Rehostable CMC FPDP Interface, for details on
the CMC card’s interface connectors.
NOTE
: A PCI FibreXtreme Carrier card is required to configure an SL240 CMC
card’s registers.
NOTE
: CRC should be used in almost all applications. It offers excellent coverage of
data errors and has very little impact on link throughput for maximum frame sizes. The
option of disabling CRC is only retained for compatibility with older third-part devices.
Both nodes on the link (or all nodes in a loop configuration) should be set to a common
CRC mode or the resulting mismatch will cause data errors and/or link errors.
NOTE
: In almost every application, flow control should be enabled. Even if the
application must sustain maximum link throughput, it is better to drop the data at the
sending source should the system experience a temporary overload condition. Some
exotic conditions could apply where flow control is not desirable, but they require very
careful system planning and should be confirmed with Curtiss-Wright Controls prior to
architectural finalization. One possible exception is for applications that cannot utilize a
duplex fiber optic link, which means status information (link up and state of flow
control) is not available from the remote node. In this circumstance, flow control should
be disabled to allow the transmitter to function without the receiver connected
normally.
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