The XCVU37P FPGA U1 cooling fan connector is shown in the following figure. The VCU128 fan circuit uses a Maxim MAX6643 fan controller that autonomously monitors the FPGA die temperature pins DXP and DXN. The fan circuit is set up to increase fan speed as the FPGA temperature increases.
Note: At initial power on, it is normal for the fan
controller to energize at full speed for a few seconds.
Figure 1. Cooling Fan Circuit