ConnectX-2 Card User Manual
Rev 1.0
Mellanox Technologies
17
2.1.5 I
2
C Compatible Interface
A three-pin header on the adapter card is provided as the I
2
C compatible interface. See Figure 9 on
page 32 for the location on the board.
Figure 4: 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 31.
2.3
QSFP Power Level
The card supports power level 3, according to SFF Committee INF-8438i Specification for QSFP
(Quad Small Formfactor Pluggable) Transceiver.
2.4
Memory
The adapter cards support multiple memory devices through the PCI Flash, and I2C compatible
interfaces.
2.4.1 System Memory
The adapter card utilizes the PCI Express interface to store and access fabric and/or Ethernet fabric
connection information and packet data on the system memory.
2.4.2 Flash
Each of the adapter cards include one 16MB SPI Flash device accessible via the Flash interface of
the MT25414B0 ConnectX
®
-2 VPI 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 Figure 9 on
page 32 for the jumper location.
