Terasic De0-Nano, User Manual

Page: 136 / 155

136
lit LED bar indicates the voltage is 3.3V and similarly no LED lit indicates 0V.
8
8
.
.
4
4
S
S
O
O
P
P
C
C
D
D
e
e
m
m
o
o
This demostration illustrates how to use the SOPC Builder to create a system with the following
functions:

Control accelerometer through 3-wire SPI interface

Control analog to digital conversion through 4-wire SPI interface

Access EEPROM memory through I2C interface

Access EPCS memory

System Block Diagram
This section describes the SOPC System Block Diagram of this demo, as shown in Figure 8-6 .
Figure 8-6 SOPC Block Diagram
A 50 MHz Clock is required for the SOPC System. A NIOS II processor is included in the system
for flow control. The PLL is used to generate clocks, including 100 MHz, 10 MHz and 2MHz. The
NIOS II Processor and SDRAM are running at 100 MHZ. The SDRAM is used to store the NIOS II
Program. The ADC SPI Controller is running at 2 MHz. The other peripheral controllers are running
at 10 MHz. The ADC SPI Controller and the Accelerometer SPI Controller are custom SOPC
component. The source code, for these two controllers, is located in the “ip” folder under this