Power Sequencing; I/O Voltage Selection; Jumper Settings Vcc_Io_A - Enclustra Mars EB1 Base Board User Manual

If power control is disabled, the Mars EB1 base board and the mounted module are powered as soon as
power is applied through external or internal power connectors.
If power control is enabled, the Mars module is not powered, even when power is applied to the Mars EB1
base board. By pressing the power button (PWR) for a short time, the power is turned on. Power can be
turned off again by pressing the power button for a configurable time. Power can also be turned on and off
by writing a system controller register - see Section 6.10 for more information.
Power control is not available when power over USB is active.
5.4

Power Sequencing

The on-board VCC_3V3 power domain is switched on when all the power supplies on the module and board
are within their range (PWR_GOOD signal is high).
PWR_GOOD Effect
0 VCC_3V3 domain is switched off
1 VCC_3V3 domain is switched on
Table 17: Power Sequencing
5.5

I/O Voltage Selection

The I/O voltage selection jumpers are used to configure the VCC_IO_A and VCC_IO_B voltages that power
the I/O banks of the SoC/FPGA device on the Mars module.
Tables 18 and 19 describe the usage of jumpers. Please note the following:
VCC_OUT is a supply output from the Mars module. The value of the voltage depends on the mounted
Mars module (Refer to the "Voltage Supply Outputs" Section in the Mars module user manual).
Only one jumper per VCC_IO_A, respectively VCC_IO_B is allowed (one choice per table)
The factory default jumper settings are 2-4 and 8-10. As a consequence of these settings, no voltage
is applied to the Mars module connector, therefore it prevents the module from booting. PWGD LED
will not be lit.
Figure 8 shows the pin numbering for connector J1200 and one configuration example.
Jumper Position
J1200 7-8
J1200 9-10
J1200 11-12
Table 18: Jumper Settings VCC_IO_A
D-0000-307-001
Function
VCC_2V5 selected
VCC_3V3 selected
VCC_OUT selected
Description
VCC_2V5 is connected to VCC_IO_A
VCC_3V3 is connected to VCC_IO_A
Module VCC_OUT is connected to VCC_IO_A
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