Features of FPGA:

(1) Using FPGA to design ASIC circuit (application-specific integrated circuit), the user can get a suitable chip without film production.

(2) FPGA can be used as a sample piece for other full-custom or semi-custom ASIC circuits.

(3) There are abundant triggers and I/O pins inside the FPGA.

(4) FPGA is one of the devices with the shortest design cycle, the lowest development cost and the lowest risk in the ASIC circuit.

(5) FPGA adopts high-speed CMOS technology with low power consumption and is compatible with CMOS and TTL levels.

(6) It can be said that FPGA chip is one of the best choices for small batch systems to improve system integration and reliability.

(7) FPGA is set up by the program stored in the on-chip RAM to set its working state. Therefore, the on-chip RAM needs to be programmed when working. Users can use different programming methods according to different configuration modes.

(8) When the power is turned on, the FPGA chip reads the data in the EPROM into the on-chip programming RAM. After the configuration is completed, the FPGA enters the working state. After a power failure, the FPGA recovers to a white film, and the internal logic relationship disappears. Therefore, the FPGA can be used repeatedly. The programming of FPGA does not require a dedicated FPGA programmer, but only needs to use a general-purpose EPROM and PROM programmer. When you need to modify the FPGA function, you only need to change a piece of EPROM. In this way, the same piece of FPGA, with different programming data, can produce different circuit functions. Therefore, the use of FPGA is very flexible.

Features of embedded systems:

(1) The system kernel is small
Because embedded systems are generally applied to small electronic devices and the system resources are relatively limited, the kernel is much smaller than traditional operating systems. Such as Enea's OSE distributed system, the kernel is only 5K, and the Windows kernel? There is simply no comparison.

(2) Strong specificity
The embedded system is highly personalized, and the combination of software system and hardware is very close. Generally, the system needs to be transplanted for the hardware. Even in the same brand and the same series of products, it is necessary to keep changing and increasing or decreasing according to the system hardware. to modify. At the same time, for different tasks, it is often necessary to make major changes to the system. The compilation and download of the program should be combined with the system. This modification and the "upgrade" of general software are completely two concepts.

(3) System simplification
Embedded systems generally have no obvious distinction between system software and application software, and are not required to be too complicated in function design and implementation, which is beneficial to control system costs and achieve system security.

(4) High real-time system software (OS) is the basic requirement of embedded software. And software requires solid-state storage for speed; software code requires high quality and reliability.

(5) If the development of embedded software is to be standardized, a multitasking operating system must be used.
Embedded system applications can run directly on the chip without an operating system; however, in order to reasonably schedule multitasking, utilize system resources, system functions, and interface with expert library functions, users must choose RTOS (Real-Time Operating System) for development. The platform can ensure the real-time and reliability of program execution, reduce development time, and ensure software quality.

(6) Embedded system development requires development tools and environments.
Because it does not have the ability to develop independently, even after the design is completed, the user usually cannot modify the program functions in it, and a set of development tools and environments can only be developed. These tools and environments are generally based on software and hardware on general-purpose computers. equipment, as well as various logic analyzers, mixed signal oscilloscopes, etc. When developing, there is often the concept of a host computer and a target computer. The host computer is used for program development, and the target computer is used as the final execution computer. It needs to be combined alternately during development.

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