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TB-KU-xxx-ACDC8K Hardware User Manual
77
Rev. 1.03
7.6. SFP+ Connectors
Located on the front panel of the TB-KU-xxx-ACDC8K are 4 SFP+ slots available to the user. These
ports are standard single SFP+ modules. For each of these modules, a 3-pin connector is available to
jumper between either RX_LOS or TX_FAULT. A jumper between pins 1-2 connects RX_LOS and
between 3-2 connects TX_FAULT.
Each SFP+ connector has a TX and an RX differential data pair that connect to Quad 232 on the FPGA.
They also connect to an I2C bus through TI’s PCA9544A 4-to-1 I2C MUX with four available interrupt
inputs for each of the downstream pairs. Available on the same component is a global interrupt input pin
which acts as a logic AND for the four interrupts. The PCA9544A
chip’s I2C address can be set through
the A[0:2] inputs through available 4.7k resistors on the board.
Figure 7-13 I2C MUX Hardware-selectable Address Pins
By default, the I2C address for this device is: 1110101_. If the last bit of the address is set to a logic 1, a
read is selected and 0 for a write. Please refer to
TI’s PCA9544A datasheet for additional information
concerning this component.