Specifications

1–26 Altera Corporation
October 2007
Creating the Example Design Nios II Hardware Development Tutorial
responds to them. Because SOPC Builder does not deal with software
behavior, it cannot make educated guesses about the best IRQ
assignment.
The Nios II HAL interprets low IRQ values as higher priority. The timer
component must have the highest IRQ priority to maintain the accuracy
of the system clock tick.
To assign appropriate base addresses and IRQs, perform the following
steps:
1. On the System menu, click Auto-Assign Base Addresses to make
SOPC Builder assign functional base addresses to each component
in the system. The Base and End values in the table of active
components might change, reflecting the addresses that SOPC
Builder reassigned.
2. Click the IRQ value for the jtag_uart component to select it.
3. Type 16 and press Enter to assign a new IRQ value.
Figure 1–13 shows the state of the SOPC Builder System Contents tab
with the complete system.
Figure 1–13. System Contents Tab with Complete System
Generate the SOPC Builder System
You are now ready to generate the SOPC Builder system. Perform the
following steps: