Mellanox Technologies ConnectX-3 MCX341A-XCAN, User Manual

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Mezzanine Card Interfaces Rev 1.9
Mellanox Technologies 14
2 Mezzanine Card Interfaces
2.1 I/O Interfaces
Each Mezzanine card includes the following interfaces:
• PCI Express (PCIe) Mezzanine connector
• SFP+ empty cage
• I
2
C-compatible connector (optional for debug purposes)
• For MCX341A-XCBN only : UEFI
2.1.1 Ethernet SFP+ Interface
The network ports of the ConnectX®-3 Mezzanine cards are compliant with the IEEE 802.3
Ethernet standards listed in
Section 1.1, “Supported Network Protocol Standards,” on page 10 .
2.1.2 PCI Express Mezzanine Connector
The ConnectX®-3 Mezzanine card connects by means of one PCIe x8 Mezzanine card connector
that holds the x8 PCIe signals from the motherboards. When connected to a PCIe Gen3 environ-
ment, firmware configures the card to use 4 lanes upon bring up.
2.1.3 I
2
C-compatible Interface
A three-pin header on the Mezzanine cards is provided as the I
2
C-compatible interface. See
Figure 9, “Mechanical Drawing of the Single-port MCX341A-XC[AB]N Mezzanine Card,” on
page 30
for the location on the board.
Figure 4: I
2
C-compatible Connector
2.1.4 Unified Extensible Firmware Interface (UEFI)
The UEFI driver is located on the device option ROM and can be used for network boot (for
example remote OS installation).
2.2 Power
All Mezzanine cards receive 5V and 3.3V power from the PCI Express Mezzanine connector. All
other required power voltages are generated by on-board switch mode regulators.
See “Specifica-
tions” on page 27.
2.3 Memory
The Mezzanine cards support multiple memory devices through the PCIe, SPI (Flash) and I
2
C
interfaces.