Adapter Card Interfaces
Rev 1.6
Mellanox Technologies
18
2.1.4 I
2
C Compatible Interface
A three-pin header on the card is provided as the I
2
C compatible interface. See
Appendix A,“Specifications,” on page 34 for the location on the board.
Figure 6: I
2
C Connector
2.2
Power
All adapter cards receive 12V and 3.3V power from the PCI Express Edge connector. All other
required power voltages are generated by on-board switch mode regulators. See “Specifications”
on page 34.
2.3
Memory
The adapter cards support multiple memory devices through the PCI Flash, and I2C.
2.3.1 System Memory
The card utilizes the PCI Express interface to store and access Ethernet fabric connection informa-
tion and packet data on the system memory.
2.3.2 Flash
Each of the cards include one SPI Flash device accessible via the Flash interface of
theMT25408B0 ConnectX-2 EN device.
There is a jumper on each adapter card that indicates to the device whether an on-board Flash
device is to be used. Table 6 provides information on this jumper. See the schematic in
Appendix A,“Specifications,” on page 34 for the jumper location.
The short bracket has the same port and LED footprint as the tall bracket.
