Focus on understanding the concept of "embedding"
Mainly understood from three aspects.
1. From the hardware, integrate the CPU-based peripheral devices into the CPU chip. For example, in the early days of the X86-based computer, the CPU only has the functions of an arithmetic unit and an accumulator. All chips must be built with external bridges to expand. Implementation, such as serial port is based on the external 16C550/2 serial controller chip, and the current serial controller chip has been integrated into the CPU, and PC has a graphics card, and most embedded processors Both have an LCD controller, but in a sense it is equivalent to a graphics card. Compared with the high-end ARM class Intel Xscale architecture, the IXP network processor CPU integrates the PCI controller (can be configured to support 4 PCI slave devices or be configured as CPI slave devices); it also integrates 3 NPE network processor engines. Two of them correspond to two MAC addresses, which can be used for gateway switching, while another NPE network processor engine supports DSL. As long as a PHY chip is added outside, DSL Internet access can be implemented. The highest frequency of the IXP series can reach 1.8G, supporting 2G memory, 1G & TImes; 10 or 10G & TImes; 1 Ethernet port or the optical channel of the Febre channel. The IXP series should be the highest processor based on the ARM system architecture and integrated by Intel into the Xscale core.
2. From the software, the application is selected in the custom operating system kernel, and the kernel is downloaded to the ROM after compilation. The application component selected when customizing the operating system kernel is to complete the "embedding" of the software. For example, when WinCE is customized in the kernel, there will be a corresponding choice, which is wordpad, PDF, MediaPlay, etc. If we choose, After the CE is started, you can find these things in the interface. If it is the Windows operating system on the PC, most of the things need to be reinstalled.
3, the software kernel or application file system and other things burned into the ROM of the embedded system hardware platform to achieve a real "embedded".
The above definition is that I gave the embedded system a self-discipline definition of understanding in 6 or 7 years ago. There are many definitions in the book, but in this field, no one can say that their definition is very exact. Including those experts and scholars, after all, embedded systems are a comprehensive discipline under the computer category.
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