商用飞机制造商在开发新型号以增加其车队时会面临艰巨的任务。
股东需要盈利能力和收入增长，航空公司需要经济回报，消费者希望以合理的价格享受豪华旅程。
但最重要的是，联邦航空管理局（F.A.A.）和欧洲航空安全局（E.A.S.A.）希望确保制造和交付的每架飞机的最高安全水平。
因此，创建了一个设计保证硬件标准RTCA / DO-254，以解决电子机载系统的这些安全问题。
FAA最初旨在适用于所有级别的电子设计，根据行业对实施成本的反馈缩小了范围。
本标准中包含五种设计保证等级（DLA）：A-灾难性故障，B-危险/严重故障，C-严重故障，D-轻微故障和E-无影响。
2005年6月发布的FAA咨询通告AC20-152声明：“此顾问通告（AC）适用于包含复杂定制微编码组件的产品或设备的制造商和安装商，其硬件设计保证级别为A，B和C
这些复杂的定制微编码组件包括专用集成电路（ASIC），可编程逻辑器件（PLD），现场可编程门阵列（FPGA）或用于飞机系统和设备设计的类似电子元件。“任何机载系统
包含ASIC，PLD或FPGA的必须遵循DO-254中包含的指导原则。
复杂的机载硬件
DO-254标准适用于复杂的机载硬件。
根据规范，如果确定性测试和分析的综合组合在所有可预见的操作条件下都不能确保正确的功能性能，则认为硬件项目是“复杂的”。
对于复杂的设备，严格的结构化设计和验证过程取代了详尽的测试。
证明复杂硬件的开发和验证符合这一过程是DO-254.1的目标
安森美半导体＆amp;
DO-254支持
安森美半导体的数字ASIC设计流程及其采用的方法完全支持需要获得DO-254认证的商用飞机制造商的严格要求。
符合DO-254标准的解决方案是设计用于飞行关键航空电子应用的任何片上系统的重要方面。
安森美半导体选择了MentorGraphics®ReqTracer™工具，以促进DO-254所需的映射，可追溯性，实施和配置管理。
ReqTracer在整个设计过程中链接，管理和跟踪来自多个来源的硬件需求，在任何阶段提供简单的文档和报告，并管理需求变更的影响。
结果是：更好地控制和预测设计进度并提高整体产品质量
DO-254文档
在整个设计过程中，会生成大量文档并提供给客户。
这包括设计计划，需求规范，测试计划，验证计划，验证报告，跟踪树和跟踪报告。
可以验证文档并追溯到收集数据的来源，并遵守DO-254认证的严格要求。
概要
安森美半导体已证明能够满足过去ASIC设计的DO-254要求。
通过我们的流程和工具，我们可以为客户提供支持DO-254认证的ASIC解决方案。
联系您当地的销售办事处，了解有关安森美半导体如何帮助您实现设计目标的更多信息
要了解更多信息，请下载应用说明：商用飞机制造商的DO-254认证支持
参考文献：
Paul Marriott博士，Anthony D. Stone。
“了解DO-254合规性以验证机载数字硬件”。
白皮书，2009年10月.Synopsys。
“ReqTracer：管理设计流程中的需求”。
数据表。
导师图形。
以上来自于谷歌翻译
以下为原文
Commercial aircraft manufactures have a daunting task when they develop a new model to add to their fleet. Shareholders demand profitability and revenue growth, airlines require economic payback and consumers want a luxurious ride at an affordable price. But most important, the Federal Aviation Administration (F.A.A.) and the European Aviation Safety Agency (E.A.S.A.) want to ensure the highest level of safety for every aircraft manufactured and delivered. As a result, a design assurance hardware standard, RTCA/DO-254 was created to address these safety concerns for electronic airborne systems.
Initially intended to apply to all levels of electronic design, the FAA reduced the scope based on industry feedback for cost of implementation. There are five Design Assurance Levels (DLAs) contained in this standard: A- Catastrophic Failure, B – Hazardous/Severe Failure, C- Major Failure, D – Minor Failure and E- No Effect. FAA Advisory Circular AC20-152, released in June, 2005 stated: “This advisor circular (AC) applies to the manufacturers and installers of products or appliances incorporating complex custom micro-coded components with hardware design assurance levels of A, B, and C. These complex custom micro-coded components include application specific integrated circuits (ASIC), programmable logic devices (PLD), filed programmable gate arrays (FPGA), or similar electronic components used in the design of aircraft systems and equipment.” Any airborne system that incorporates ASICs, PLDs or FPGAs must follow the guidelines contained in DO-254.
Complex Airborne Hardware
The DO-254 standard applies to complex airborne hardware. According to the specification, a hardware item is considered “complex” if a comprehensive combination of deterministic tests and analyses cannot ensure correct functional performance under all foreseeable operating conditions. For complex devices, a rigorous, structured design and verification process takes the place of exhaustive testing. Demonstrating that the development and verification of complex hardware complies with this process is the objective of DO-254.1
ON Semiconductor & DO-254 Support
ON Semiconductor’s digital ASIC design flow and the methodology it employs, fully supports the stringent requirements of commercial aircraft manufacturers that need to obtain DO-254 certification. A DO-254 compliant solution is an essential aspect of any system-on-a-chip designed for use in flight critical avionics applications. ON Semiconductor has chosen the Mentor Graphics® ReqTracer™ tool to facilitate the mapping, traceability, implementation and configuration management required by DO-254. ReqTracer links, manages and tracks hardware requirements from multiple sources throughout the design process, provides easy documentation and reports at any stage, and manages the impact of requirement changes. The result: better control and predictability of design schedules and improved overall product quality.2
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DO-254 Documentation
Throughout the design process, a significant amount of documentation is generated and supplied to the customer. This includes a design plan, requirements specification, test plan, verification plan, a verification report, trace tree, and trace reports. The documentation can be verified and traced to the origin of the collected data and adheres to the stringent requirements for DO-254 certification.
Summary
ON Semiconductor has demonstrated the ability to meet DO-254 requirements on past ASIC designs. With the processes and tools we have in place, we can provide our customers with an ASIC solution that supports DO-254 certification. Contact your local sales office to learn more about how ON Semiconductor can help meet your design objectives.
To learn more, download the application note: DO-254 Certification Support for Commercial Aircraft Manufacturers
References:
- Dr. Paul Marriott, Anthony D. Stone. “Understanding DO-254 Compliance for the Verification of Airborne Digital Hardware”. White Paper, October, 2009. Synopsys.
- “ReqTracer: Managing Requirements in your Design Flow”. Data Sheet. Mentor Graphics.
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