Altera Corporation
Reference Manual
2–19
May 2006
Stratix II GX EP2SGX90 Transceiver Signal Integrity Development Board
Board Components & Interfaces
shows the LED schematic.
Figure 2–11. LED Schematic
7-
S
egme
n
t Di
s
play
s
(D9, D10)
Board references D9 and D10 are dual user-defined, seven-segment
displays. The primary function of the 7-segment displays is to display the
board’s hardware version, which simplifies board revision control.
To save board space, the 7-segment displays are a small form factor. Each
segment is individually controlled by a general purpose I/O pin. When
the EP2SGX90 FPGA pin drives logic
0
, the corresponding segment
illuminates. See
1
2
R
N
2
220
Ω
R_PACK-4
USER_LED0
USER_LED2
USER_LED3
USER_LED4
USER_LED5
USER_LED6
USER_LED7
USER_LED
8
7
7
3
6
4
5
3
V
3
1
2
R
N
3
R_PACK-4
7
7
3
6
4
5
D1
LED GREE
N
1
2
D2
LED GREE
N
1
2
D3
LED GREE
N
1
2
D4
LED GREE
N
1
2
D5
LED GREE
N
1
2
D6
LED GREE
N
1
2
LED GREE
N
1
2
D
8
D7
LED GREE
N
1
2