Altera DE1-SoC, Manual, Page: 4 / 45

DE1-S
O
C C
OMPUTER
S
YSTEM WITH
N
IOS
II
For Quartus II 15.0
Some of the parallel ports in the DE1-SoC Computer have registers at addresses
Base
+ 8 and
Base
+ C, as indicated
in Figure 2 . These registers are discussed in Section 3 .
2.4.1 Red LED Parallel Port
The red lights LEDR
9 − 0
on the DE1-SoC board are driven by an output parallel port, as illustrated in Figure 3 . The
port contains a 10-bit write-only Data register, which has the address
0xFF200000
. This register can be written
using word accesses, and the upper bits not used in the registers are ignored.
0 x FF200000
LEDR
0
LEDR
9
Address
0 31 9 10
. . . Unused Data register
Figure 3. Output parallel port for LEDR .
2.4.2 7-Segment Displays Parallel Port
There are two parallel ports connected to the 7-segment displays on the DE1-SoC board, each of which comprises
a 32-bit write-only
Data register. As indicated in Figure 4 , the register at address
0xFF200020
drives digits HEX3
to HEX0 , and the register at address
0xFF200030
drives digits HEX5 and HEX4 . Data can be written into these
two registers by using word operations. This data directly controls the segments of each display, according to the bit
locations given in Figure
4 . The locations of segments 6 to 0 in each seven-segment display on the DE1-SoC board
is illustrated on the right side of the figure.
0 x FF200020
...
HEX0
6-0
...
HEX1
6-0
...
HEX3
6-0
Address
0 7 6 8 15 14 24 31 30
0 x FF200030
...
HEX2
6-0
16 23 22
...
HEX4
6-0
...
HEX5
6-0
0 7 6 8 15 14 24 31 30 16 23 22
Data register
Data register
0
1
2
3
4
5 6
Segments
Unused
Figure 4. Bit locations for the 7-segment displays parallel ports.
4 Altera Corporation - University Program
2015