Lattice Semiconductor XP2 Advanced User Manual page 6

Lattice Semiconductor
For the VCC_ADJ adjustable voltage, the ispPAC-POWR1220AT8 will detect the voltage rail and show the status
using five LEDs. Each of these five LEDs indicates a particular voltage range. If the VCC_ADJ is in one of the volt-
age ranges, the corresponding LED will be turned ON and the other LEDs will be turned OFF, otherwise these five
LEDs will be turned ON and then OFF sequentially so that you will see a light keep moving between the LEDs. The
five LEDs and corresponding voltages are listed in Table 4.
Table 4. Monitoring of VCC_ADJ Power Voltages
LatticeXP2 I/O Bank Voltage Setting
The jumpers listed in Table 5 allow the user to select the voltage (V
the LatticeXP2 device. Certain restrictions apply depending on which features of the board are being used.
Table 5. V Selection Jumper
CCIO
Depending on the optional devices installed, some sysIO banks may have restrictions. For each of J34 and J37
only select one bank voltage position at that jumper. For example, attaching more than one jumper to J34's 6
square pins will short supplies.
Table 6. sysIO Bank Considerations
The following tables detail the various I/O standards supported by the LatticeXP2 sysIO structures. More informa-
tion can be found in technical note TN1136,
LED
D11
D12
D13
D14
D15
sysIO™ Bank
0
6
1
2
3
4
5
7
Bank
0 Selectable. CompactFlash requires 3.3V.
1 Cannot be changed
2
3
4
5
6 Selectable. Video TX/RX requires 2.5V.
7 Cannot be changed
LatticeXP2 sysIO Usage
Indicating Voltage Range
3.3V +/- 5%
2.5V +/- 5%
1.8V +/- 5%
1.5V +/- 5%
1.2V +/- 5%
) applied to each of the eight I/O banks of
CCIO
Jumper Jumper on Pins
J34 1-3 -> VCC_3.3V
2-4 -> VCC_2.5V
3-5 -> VCC_1.8V
J37
4-6 -> VCC_ADJ
Setting
Guide.
6
LatticeXP2 Advanced
Evaluation Board User's Guide
VCC_2.5V
VCC_1.8V
VCC_1.8V
VCC_3.3V
VCC_3.3V
VCC_3.3V