Specifications

5.2.2 SFP+ Control Jumpers JP3, JP4 and JP5
• JP3: TX_ENABLE; If this jumper is left open, the TX is disabled. The state of this pin is indicated
by D2.
• JP4: Rate_Select_0 (RS0); Not all SFP+ modules offer rate select functionality. This hardware
setting only affects modules with RX Rate Select (RS0) functionality and when in the lower logic
state, can be overridden by firmware. If this jumper is left open, then RX operation is optimized for
maximum data rate in SFP+ modules with rate select functionality. If this jumper is shorted, RX
Rate select is asserted and the RX operation in SFP+ modules with rate select functionality is
optimized for lower data rates per SFF-8079, INF-8074i and SFF-8472. The state of this pin is
indicated by D6.
• JP5: Rate_Select_1 (RS1); Not all SFP+ modules offer rate select functionality. This hardware
setting only affects modules with TX Rate Select (RS1) functionality and when in the lower logic
state, can be overridden by firmware. If this jumper is left open, then TX operation is optimized for
maximum data rate in SFP+ modules with rate select functionality. If this jumper is shorted, TX
Rate select is asserted and the TX operation in SFP+ modules with rate select functionality is
optimized for lower data rates per SFF-8079, INF-8074i and SFF-8472. The state of this pin is
indicated by LED D8.
6 LED Status Indicators on the Evaluation Board
A number of LEDs on the board indicate the status of various parameters. Table 3 below provides a
list of the LEDs and their function. The location of each LED on the board is shown in Figure 7, on
page 11. Each LED is described in more detail in the following section.
10
Application Note: SFP+ Evaluation Board
Table 3 LED Status Indicators
N Label Description Color Condition indicated when illuminated
1 TX FLT TX_FAULT RED Transmitter Fault condition exists
2 TX DIS TX_DISABLE RED Transmitter is disabled
3 SDA DATA YELLOW Data is active
4 SCL CLOCK YELLOW Clock is active
5 MDF0 MOD-ABS YELLOW Module is absent
6 RS0 RS0 GREEN RX Rate Select is asserted
7 RX LOS RX_LOS RED No Data signal at RX
8 RS1 RS1 GREEN TX Rate Select is asserted
9 5V ON 5V Power GREEN 5V power applied
10 VR ON VccR GREEN Receiver power supply is on
11 VT ON VccT GREEN Transmitter power supply is on
12 3.3V ON 3.3V Power GREEN 3.3V power applied