Power; Power Generation Overview; Vcc_Io Pins; Generated Power Supplies - Enclustra Mars XU3 User Manual

A 100 MHz LVDS oscillator and a 27 MHz CMOS oscillator provide reference clock inputs to the PS GTR bank
505. Please refer to Section 2.12 for details.
Warning!
The maximum data rate on the MGT lines on the Mars XU3 SoC module depends on the routing path
for these signals. Adequate signal integrity over the full signal path must be ensured when using MGTs
at high performance rates.
Warning!
No AC coupling capacitors are placed on the Mars XU3 SoC module on the MGT lines - make sure
capacitors are mounted, if required, on the base board (close to the module pins), to prevent MGT lines
from being damaged.
2.11

Power

2.11.1

Power Generation Overview

The Mars XU3 SoC module uses a 3.3 - 5.0 V DC power input for generating the on-board supply voltages
(0.72/0.85/0.9 V, 0.85/0.9 V, 1.2 V, 1.8 V, 2.5 V). Some of these internally-generated voltages are accessible
on the module connector. In addition, a separate 3.3 V power input is used to supply peripherals, such as
the Ethernet PHY, USB PHY, QSPI flash, eMMC flash, and EEPROM. The 3.3 V input is also used to generate
a 2.5 V voltage required to supply the DDR chips, LEDs and oscillators.
Besides the required VCC_IO and VCC_CFG voltages, the Mars XU3 SoC module can be powered using a
single power supply. In this case, the two voltage supply inputs VCC_MOD and VCC_3V3 must be connected
together to a 3.3 V supply. Please refer to Section 2.11.3 for details on the voltage supply inputs. For the
VCC_IO pins usage, please refer to Section 2.9.5.
Table 11 describes the power supplies generated on the module.
Voltage Voltage
Supply Name Value
VCC_INT 0.72/0.85/0.9 V (PL core supply)
VCC_PSINT 0.85/0.9 V (PS core supply)
VCC_BAT_FPGA 1.2 V
VCC_1V2 1.2 V
VCC_1V8 1.8 V
VCC_2V5 2.5 V
Table 11: Generated Power Supplies
In the standard configuration the PL core supply is 0.85 V. For custom configurations, in which a speedgrade
-2LE or -1LI device is used, it is possible to switch to low power mode, by pulling PWR_LP_EN# signal (PS
D-0000-432-001
Rated Voltage
Current Source
3 A VCC_MOD Yes
3 A VCC_MOD Yes
10 mA VCC_BAT
2 A VCC_MOD Yes
2 A VCC_MOD Yes
0.2 A VCC_3V3
22 / 52
Shut Influences
down
via PWR_GOOD
PWR_EN
Yes
Yes
No No
Yes
Yes
Yes No
Version 04, 25.07.2019