* Question
| How many layers does the Nios II architecture go from hardware to software? |
* Answer
| The Nios II architecture can be divided into three layers from hardware to software: hardware control layer, device driver layer, and hardware abstraction layer system library (HAL), as shown in Figure 3.1 (see Figure 3.1 on page 35)..In the eyes of developers, the interface between the device driver layer and the hardware control layer is an abstraction of a set of registers, so in the higher-level HAL software implementation, you can often see similar IOWR (base address, offset, data).Write register function and IORD (base address, offset) read register function. |
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