FMCP HSPC Connector J18 VADJ Power Rail
The VCU128 evaluation board implements the ANSI/VITA 57.4 IPMI support functionality. The
power control of the VADJ power rail is managed by the U42 system controller. This rail powers
both the FMCP HSPC (J18) VADJ pins, as well as XCVU37P U1 HP banks 71 and 72 (see
). The valid values of the VADJ rail are 1.2V, 1.5V, and 1.8V.
At power on, the system controller detects if an FMC module is connected to FMCP J18:
• If no FMC card is attached to the FMC port, the VADJ voltage is set to 0V
• When an FMC card is attached, its IIC EEPROM is read to find a VADJ voltage supported by
both the VCU128 board and the FMC module, within the available choices of 1.2V, 1.5V, 1.8V,
and 0.0V
• If no valid information is found in the IIC EEPROM, the VADJ rail is set to 0V
The system controller user interface allows the FMC IPMI routine to be overridden and an
explicit value to be set for the VADJ rail.
Monitoring Voltage and Current
, callout 35]
Voltage and current monitoring and control for the Intersil power system is available through
either the VCU128 system controller or the Intersil PowerNavigator software GUI. The VCU128
system controller is a simple and convenient way to monitor the voltage and current values for
the power rails listed in the following table. The Intersil programmable power controllers listed in
the table can also be accessed through the 2x3 male pin header J1. Using this connector requires
the Intersil ZLUSBEVAL3Z USB to PMBus adapter. This adapter cable can be ordered from the
Intersil website (see
). The associated Intersil PowerNavigator software GUI can be
downloaded from the Intersil website. The Intersil programmable controller and INA226 power
monitor I2C bus mapping is shown in the following table.
Table 33: Programmable Controller and INA226 Power Monitor I2C Bus Mapping
Schematic
Page
Rail Name
Regulator Type
U# Vout
(V)
Iout
Range
(A)
I2C
Address
INA226
U#
I2C
Address
Programmable Regulators and INA226 Map
Programmable Regulators
54
VCCINT (PWM[2:6])
ISL68127IRAZ-TR5823
U31
0.72 -
0.85
125
0X65
U84
0x40
54
VCCBRAM (PWM[0])
ISL68127IRAZ-TR5823
U31
0.72 -
0.85
30
0X65
U86
0x41
56
VCC1V8 (PH_A/B)
ISL91302BIKZ-TR5814
U15
1.8
4 - 6
0x63
U14
0X42
Chapter 3: Board Component Descriptions
UG1302 (v1.1) April 21, 2021
VCU128 Board User Guide
88