Applying Power To The Board; Power Supplies; Pci Express Power Interface - Lattice Semiconductor LFSC80E-P4-EV User Manual

Lattice Semiconductor
Note: The connections referenced in this document refer to the LFSCM3GA80 device. Available I/Os and associ-
ated sysIO™ banks may differ for other densities within this device family.

Applying Power to the Board

The LatticeSC PCI Express x4 Evaluation Board is ready to power on. The evaluation board can be supplied with
power from an AC wall-type transformer power supply shipped with the board. Or it can be supplied from a bench-
top supply via terminal screw connections. It also has provisions to be supplied from the PCI Express edge fingers
from a host board.
To supply power from the factory-supplied wall transformer, simply connect the output connection of the power cord
to J3 and plug the wall transformer into an AC wall outlet.

Power Supplies

(see Appendix A, Figure 9)
The evaluation board incorporates an alternate scheme to provide power to the board. The board is equipped to
accept a main supply via the TB1 connection. This connection is provided to use with a bench-top supply adjusted
to provide a nominal 12V DC.
All input power sources and on-board power supplies are fused with surface mounted fuses and have green LEDs
to indicate power GOOD status of the intermediate supplies
Table 1. Board Power Supply Fuses- (see Appendix A, Figure 9)
Table 2. Board Power Supply Indicators- (see Appendix A, Figure 9)
Alternatively, external power can be connected rather than the wall transformer power pack.
Table 3. Board Supply Disconnects- (see Appendix A, Figure 9)
TB1

PCI Express Power Interface

(see Appendix A, Figure 10)
Power can be sourced to the board via the PCB Edge Finger (CN1). This interface allows the user to provide power
from a PCI Express host board.
F1
F2
F3
F4
F5
F6
D14 1.0V/1.2V VCC Core Source Good Indicator
D15 1.5V Source Good Indicator
D16 1.8V Source Good Indicator
D12 2.5V Source Good Indicator
D13 3.3V Source Good Indicator
D17 1.2V Source Good Indicator
Screw terminal for 12V DC Pin1(square PCB pad) -> +12V DC Pin2 -> Ground
LatticeSC PCI Express x4 Evaluation Board
1.0V/1.2V Fuse
3.3V Fuse
1.5V Fuse
1.2V Fuse
2.5V Fuse
1.8V Fuse
4
User's Guide