User manual

ConnectX®-3 Ethernet Single and Dual QSFP+ Port Adapter Card User Manual Rev 1.7
Mellanox Technologies
17
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 30.
2.3 Power Level
The adapter cards support power levels according to SFF Committee SFF-8436 Specification for
(Small Form-factor Pluggable) Transceiver.
2.4 Memory
The adapter cards support multiple memory devices through the PCIe, SPI (Flash) and I
2
C inter-
faces.
2.4.1 System Memory
The adapter cards utilize the PCI Express interface to store and access Ethernet fabric connection
information and packet data on the system memory.
2.4.2 SPI
Each of the adapter cards includes one 16MB SPI Flash device (M25PX16-VMN6P device by ST
Microelectronics) accessible via the SPI interface of the ConnectX®-3 device.
When a jumper is inserted into the drill holes in the adapter
it indicates to the device that the on-
board Flash device should not be used for boot instructions. Contact your Mellanox support repre-
sentative should you need to use this jumper
. Table 5 provides information on this jumper. The
jumper location on the board is illustrated
in Appendix A.3, “Board Mechanical Drawing and
Dimensions,” on page 32.
Table 5 - Jumper Configuration
Description Option
Card Default
Configuration
Flash present/
not present
connection open – Flash present
connection shorted – Flash not present
connection open –
Flash present