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FibreXtreme User Guide
PRODUCT OVERVIEW
Copyright 2017
4.2 SL240 PCIe Features
SL240 PCIe provides reliable highly scalable point-to-point serial I/O interconnects between
systems, with minimal overhead and very low latency. The protocol involved for this transport is
based on Fibre Channel, though it is not Fibre Channel compliant.
The SL240 PCIe cards incorporate the functionality of four independent Serial FPDP 5 Gbps
channels on a single Host Bus Adapter (HBA). This compact design minimizes the number of
required host computer slots, while providing the performance of two separate x4 HBAs. As a
result, an efficient Serial FPDP system is established using only a minimal number of PCI express
slots.
The physical media interface of the SL240 PCIe is the Small Form-factor Pluggable (SFP)
Optical Transceiver. The SFP transceivers can be plugged into the card and are removable.
· The major SL240 PCIe features are listed below:
· x8 Link.
· Full-duplex PCI Express lanes; 5 Gbps each.
· Automatic lane reversal.
· 8b/10b encoding.
· Link training (auto-negotiate to smallest link width).
· 256 byte maximum payload size.
· End-to-end CRC and data poisoning.
· Advanced error reporting.
· Link management.
· Advanced flow control.
· Turn off unused lanes for power reduction.
Additional SL240 PCIe Features are:
· Contains four independent Serial FPDP channels.
· Minimizes implementation cost and enhances throughput by using a simple protocol.
· Provides built-in data synchronization with very little reduction in throughput.
· Integrated interrupt controller to report link failure, transaction completion, or buffer
space request.
· Status LEDs that reports link stability for each PCIe lane
· Loop operation with out-of-band arbitration or point-to-point operation.
· Provides a register set designed for easy programming and status retrieval.
· Small Form-factor Pluggable (SFP) short wavelength laser media.
· 256 MB Receive FIFO (shared by all 4 channel).
· 1 KB Transmit FIFO (per channel).
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