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Lattice Semiconductor
SW2 and SW8 on the right side and the upper side of the board are 8-pin DIP switches. The pull-up resistors asso-
ciated with these switches are wired to 3.3V. A switch in the down position produces a low (0), the up position pro-
duces a high (1). All signals of SW8 are debounced before connecting to LatticeXP2 I/O pins. Table 13 shows the
SW8 connections to the LatticeXP2 and Table 14 shows the SW2 connections to ispPAC-POWR1220AT8 I/O pins.
Table 13. 8-Position Switch SW8
Table 14. 8-Position Switch SW2
LEDs
The eight user-definable LEDs are provided on the lower right side of the board. These LEDs are each wired to a
separate general purpose I/O as defined in the Table 15. The current limiting resistors associated with these LEDs
are wired to 3.3V but it is safe to use any FPGA I/O voltage. The LED will light when its associated I/O pin is driven
low.
Table 15. Connection between LEDs and LatticeXP2
LED
D17
D18
D19
D20
Table 16 describes the three LEDs associated with the dedicated programming pins.
Table 16. Programming LEDs
LED
D27
D29
D28
Switch (Position#)
SW8 (position #1)
SW8 (position #2)
SW8 (position #3)
SW8 (position #4)
SW8 (position #5)
SW8 (position #6)
SW8 (position #7)
SW8 (position #8)
Switch (Position#)
SW2 (position #1)
SW2 (position #2)
SW2 (position #3)
SW2 (position #4)
SW2 (position #5)
SW2 (position #6)
SW2 (position #7)
SW2 (position #8)
LatticeXP2 I/O
Bank
AB18
4
AB19
4
V12
4
U12
4
Pin
PROGRAMN
INIT
DONE
Evaluation Board User's Guide
LatticeXP2 I/O
sysIO Bank
W15
U16
T16
Y15
Y16
Y18
Y17
W18
POWR1220AT8
I/O Pin
Pin Name
97
1
2
4
6
7
89
90
LED
LatticeXP2 I/O
D21
D22
D24
D25
Color
Yellow
On when signal is low
Red
On when initializing
Green
On when config is complete
11
LatticeXP2 Advanced
4
4
4
4
4
4
4
4
IN1
IN2
IN3
IN4
IN5
IN6
VPS0
VPS1
Bank
Y14
4
AA13
4
AB16
4
AB17
4
Function
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