Embedded systems and system-level programmable data sheet

7 embedded system design issues 7.1 system although embedded system applications face a very broad, the complexity of application vary, personalized requirements.

However, the overall design of embedded system requires consideration of key issues still can be summarized into the following areas: · in-depth analysis of the system, have a thorough understanding of the application depending on the application needs. ·, forming the overall scheme, select or to build a development platform, complete algorithms and architectures for mapping; formation of hardware and software co-design programme; · embedded processor selection; · real-time operating system (RTOS) selection; · development tools (such as compilers, emulators) selection or development; design · data paths; · Testability design; design · reusability; · to imitated card, verify that the establishment of the environment; · the target node of planning; 7.2 embedded processor embedded processor is based on application and user-oriented core embedded system, because the application-oriented, object-oriented features of the industry, for different applications and different semiconductor process, various kinds of embedded processors variants include more than 1000 can be divided into: · embedded microprocessor: arm, MIPS, PowerPC, 68000, 386EX; · embedded microcontroller: 8051, MC68HC05, MC68HC11, 68300, Am186, TMS320C2X; · embedded DSP processors: TMS320 series, DSP56000 series; · embedded SOC (System on chip): OMAP, M-Core; 7.3 embedded processor development with embedded applications of expanding, such as disk drives, mobile phone, PDA, network switches, printers, and so on, to define the concept of the "embedded" in itself is becoming increasingly difficult. But what is certain is that many embedded applications in areas such as performance, cost, power consumption, and other indicators are ever-changing requirements. In order to adapt to the different requirements of the application for a variety of processors are also rapidly. The following to apply a broad United Kingdom ARM company's embedded ARM processor, for example, for analysis. ARM processor microarchitecture of evolution--for the past 10 years, ARM processor developed from simple ARM7TDMI core development to the latest arm11EJ-S kernel, its major progress: · from simple three-line to 8-level advanced pipeline architecture. Single clock for comparison, the performance difference was not significant. · ARM11 is the ARM family of performance of a series. ARM7TM usually only in the following frequencies of 200MHz; in 0.13 Micron process, arm11TM run frequency up to 500-700MHz, brought more powerful ARM processors · performance. increasing line series, structure and design improvements. In arm1026EJ-STM kernel, with a return stack, reduce the subroutine returns the line refresh time, improves system performance arm11 increased ·. static and dynamic combinations of jump prejudging. · arm11 support single instruction multiple data (SIMD) instructions. 7.4 real-time operating system (RTOS) software is one of the core for embedded systems, embedded systems often have real-time requirements, and real-time operating systems with simple, compact, and other characteristics, as a result, embedded systems often use embedded real-time operating system. For embedded systems and real-time operating systems, however, not every embedded real-time operating system can support the embedded processor. Therefore, the embedded processor with embedded real-time operating system selection must also consider. Common embedded real-time operating system: VxWorks; · OS-9 ·; · PSOS; · QNX · VRTX;; · real time operating system based on Linux; · real time operating system based on Windows; · domestic independent development of real-time operating systems;