VCU118 Board User Guide 108
UG1224 (v1.0) December 15, 2016
www.xilinx.com
Chapter 3: Board Component Descriptions
FMC VADJ_1V8 Power Rail
The VCU118 evaluation board implements the ANSI/VITA 57.1 section 5.5.1 IPMI support
functionality. The power control of the VADJ_1V8 power rail is significantly different from
other Xilinx evaluation boards, and is managed by the U111 system controller. This rail
powers both the FMCP HSPC (J22) and the FMC HPC1 (J2) VADJ pins, as well as the XCVU9P
HP banks 43, 45, 66, 67, and 70 (see I/O Voltage Rails). The valid values of the VADJ_1V8 rail
are 1.2V, 1.5V, and 1.8V.
At power on, the system controller detects if an FMC module is connected to each interface:
• If no cards are attached to the FMC ports, the VADJ voltage is set to 1.8V.
• When one FMC card is attached, its IIC EEPROM is read to find a VADJ voltage
supported by both the VCU118 board and the FMC module, within the available
choices of 1.2V, 1.5V, 1.8V, and 0.0V.
• When two FMC cards are attached with differing VADJ requirements, VADJ_1V8 is set to
the lowest value compatible with the VCU118 board and the FMC modules, within the
available choices of 1.2V, 1.5V, 1.8V, and 0.0V.
• If no valid information is found in the IIC EEPROMs, the VADJ_1V8 rail is set to 0.0V.
The system controller user interface allows the FMC IPMI routine to be overridden and an
explicit value can be set for the VADJ_1V8_FPGA rail.
Monitoring Voltage and Current
[Figure 2-1, callouts 32, 37]
Voltage and current monitoring and control for the Maxim power system is available
through either the VCU118 system controller or the Maxim PowerTool software GUI.
The VCU118 system controller is the simplest and most convenient way to monitor the
voltage and current values for the power rails listed in Table 3-34.
The Maxim PMBus power controllers listed in Table 3-34 can also be accessed through the
PMBus connector J39. Using this connector requires the Maxim PowerTool USB cable
(Maxim part number MAXPOWERTOOL002#). This cable can be ordered from the Maxim
Integrated website [Ref 28]. The associated Maxim PowerTool GUI can be downloaded from
the Maxim website.
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