5
LatticeXP2 Advanced
Lattice Semiconductor
Evaluation Board User’s Guide
LatticeXP2 Device
This board features a LatticeXP2 FPGA with a 1.2V DC core in a 484-ball fpBGA package. The default device is
the LatticeXP2-17. Any other LatticeXP2 density in this package can be accommodated. A complete description of
this device can be found on the Lattice web site at
www.latticesemi.com
.
Power Setup
The board is supplied by a single 5.0V to 28.0V DC power supply. On-board regulators will provide the necessary
supply voltages. The on-board regulators supply 3.3V, 2.5V, 1.8V, 1.2V, and an adjustable voltage (VCC_ADJ). The
adjustable voltage is set by the potentiometer VR1 and can be set to a value between 1.22V and 3.25V. The DC
power may be applied through the power jack at J54 using an AC adapter with a 5.0V to 28.0V DC output range.
Requirements for the power jack are listed in Table 1. The on/off switch (SW9) can be used as a convenience to
disable power jack J54. Be sure that SW9 is in the “on” position for normal operation.
The DC power may also be applied using a workbench power supply through the banana jacks at J53 (VCC_IN)
and J51 (GND). The workbench power supply voltage has to be between 5.0V and 28.0V.
Table 1. Power Jack J54 Specifications
Polarity
Positive Center
Inside Diameter
0.1” (2.5mm)
Outside Diameter
0.218” (5.5mm)
Current Capacity
Up to 4A
Power may also be supplied directly for each individual supply rail using banana jack connectors. To enable this
mode of operation, the appropriate fuses must be removed. All power sources must be regulated to the specifica-
tions in Table 2. No special power sequencing is required for the evaluation board.
Table 2. Individual Control of Supplies
Supply
Jack
Fuse
Requirement
3.3V
J50
F5 (3.0A)
+/- 5%
2.5V
J41
F1 (3.0A)
+/- 5%
1.8V
J47
F3 (10.0A)
+/- 5%
1.2V
J48
F4 (3.0A)
+/- 5%
VCC_ADJ
J46
F2 (1.5A)
User-defined
Power Voltage Monitoring
A Lattice’s ispPAC Power Manager II device, ispPAC-POWR1220AT8, is used for monitoring various voltages on
the board. There are six LEDs used to indicate the status of the monitoring voltages. If the monitoring voltage is not
in the +/- 5% voltage window, the corresponding LED will be flashing, otherwise the LED will stay ON. Table 3
shows these six voltages and the corresponding LEDs.
Table 3. Individual Monitoring of Six Power Voltages
Voltage
LED
Monitoring Voltage Range
3.3V
D5
3.3V +/- 5%
2.5V
D6
2.5V +/- 5%
1.8V
D7
1.8V +/- 5%
1.2V
D8
1.2V +/- 5%
Vref
D9
0.9V +/- 5%
Vtt
D10
0.9V +/- 5%
