Adapter Card Interfaces
Rev 1.4
Mellanox Technologies
16
Table 4 - Physical and Logical Link Indication
LED
Function
Green - physical link
•
Constant on indicates a good physical link
•
If neither LED is lit, then the physical link has not been established
Yellow -
logical (data activity
link)
•
A blinking yellow indicates activity (data transfer)
•
Stays off when there is no activity
The short bracket has the same port and LED footprints as the tall bracket.
2.1.4 I
2
C-compatible Interface
A three-pin header on the adapter cards is provided as the I
2
C-compatible interface. See Figure 10,
“Mechanical Drawing of the Dual-port MCX312A-XCBT Adapter Card,” on page 32 for the loca-
tion on the board.
Figure 4: I
2
C-compatible 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
SFP+ Power Level
The adapter cards support power levels according to SFF Committee SFF-8431 Specification for
SFP+ (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.
