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Chapter 3: Building the SOPC System 3–11

Coordinate Components in the System

Preliminary

Reassign Component Base Addresses to Eliminate Memory Conflicts

To reassign component base addresses to eliminate undesired overlap between the

address spaces of different components, perform the following steps:

1. On the System menu, click Auto-Assign Base Addresses. The tool assigns

appropriate base addresses for the components.

2. To remove the error shown in Figure 3–9, which the tool could not resolve

automatically, reassign the cpu_ddr_clock_bridge base address manually in

the Base column by double-clicking the address and typing 0x00000000.

3. To view the address map for the system, click Address Map. The Address Map

dialog box appears.

4. Click Close.

Set Interrupt Priorities

To render images on the LCD screen smoothly, the lcd_sgdma component must

continuously service the frame buffer without stalling. When the lcd_sgdma

completes a transaction, it must be updated immediately by the Nios II processor.

Therefore, lcd_sgdma must have the highest interrupt priority, followed by the

timer, jtag_uart, and touch-screen components. The lowest interrupt value indicates

the highest interrupt priority. Assign interrupt priorities to the system components by

performing the following steps for each interrupt-request (IRQ) port listed in

Table 3–4:

1. In the IRQ column, double-click the box with the current interrupt priority setting.

In Figure 3–10, the IRQ column is the rightmost column.

Figure 3–9. Base Address Setting Conflict that Requires Manual Reassignment

Figure 3–10. Interrupt Request Priority of lcd_sgdma Component

1 2 ... 18 19 20 21 22 23 24 25 26 27 28 ... 45 46

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